0.19.0

build: update dependencies
docs: correct copyright years
2026-01-17 23:22:54 +00:00 · 2019-05-17 12:33:37 +02:00 · 2019-05-17 08:50:20 +00:00 · 2019-05-17 08:50:20 +00:00 · 2019-05-17 08:50:20 +00:00 · 2019-05-17 08:50:20 +00:00
88 changed files with 1372 additions and 1070 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# [0.18.0](https://gitlab.com/openstapps/core/compare/v0.17.0...v0.18.0) (2019-05-14)
+
+
+### Features
+
+* add study module interface ([d3790ad](https://gitlab.com/openstapps/core/commit/d3790ad))
+
+
+
 # [0.17.0](https://gitlab.com/openstapps/core/compare/v0.16.0...v0.17.0) (2019-04-16)


--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
  "name": "@openstapps/core",
-  "version": "0.18.0",
+  "version": "0.19.0",
  "lockfileVersion": 1,
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        "commander": "2.20.0",
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+      "version": "3.4.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz",
+      "integrity": "sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==",
      "dev": true
    },
    "uglify-js": {
-      "version": "3.5.9",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.9.tgz",
-      "integrity": "sha512-WpT0RqsDtAWPNJK955DEnb6xjymR8Fn0OlK4TT4pS0ASYsVPqr5ELhgwOwLCP5J5vHeJ4xmMmz3DEgdqC10JeQ==",
+      "version": "3.5.12",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.5.12.tgz",
+      "integrity": "sha512-KeQesOpPiZNgVwJj8Ge3P4JYbQHUdZzpx6Fahy6eKAYRSV4zhVmLXoC+JtOeYxcHCHTve8RG1ZGdTvpeOUM26Q==",
      "dev": true,
      "optional": true,
      "requires": {
@@ -3704,6 +3733,12 @@
      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
      "dev": true
    },
+    "uuid": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+      "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
+      "dev": true
+    },
    "validate-npm-package-license": {
      "version": "3.0.4",
      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -3754,6 +3789,12 @@
        "strip-ansi": "^3.0.1"
      },
      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
        "is-fullwidth-code-point": {
          "version": "1.0.0",
          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
@@ -3773,6 +3814,15 @@
            "is-fullwidth-code-point": "^1.0.0",
            "strip-ansi": "^3.0.0"
          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
        }
      }
    },
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "@openstapps/core",
-  "version": "0.18.0",
+  "version": "0.19.0",
  "description": "StAppsCore - Generalized model of data",
  "keywords": [
    "Model",
@@ -22,7 +22,7 @@
    "pack": "openstapps-core-tools pack",
    "prepublishOnly": "npm ci && npm run build",
    "schema": "node --max-old-space-size=8192 --stack-size=10240 ./node_modules/.bin/openstapps-core-tools schema src/core lib/schema",
-    "test": "nyc mocha --require ts-node/register --ui mocha-typescript test/*.spec.ts",
+    "test": "nyc mocha --require ts-node/register --require source-map-support/register --ui mocha-typescript test/*.spec.ts",
    "tslint": "tslint 'src/**/*.ts'"
  },
  "author": "Karl-Philipp Wulfert <krlwlfrt@gmail.com>",
@@ -39,6 +39,7 @@
  "dependencies": {
    "@types/geojson": "1.0.6",
    "@types/json-patch": "0.0.30",
+    "@types/node": "10.14.6",
    "fast-clone": "1.5.13",
    "json-patch": "0.7.0",
    "jsonschema": "1.2.4",
@@ -46,23 +47,23 @@
  },
  "devDependencies": {
    "@krlwlfrt/async-pool": "0.1.0",
-    "@openstapps/configuration": "0.12.0",
+    "@openstapps/configuration": "0.14.0",
    "@openstapps/core-tools": "0.6.0",
-    "@openstapps/logger": "0.0.5",
+    "@openstapps/logger": "0.1.0",
    "@types/chai": "4.1.7",
-    "@types/node": "10.14.4",
    "@types/rimraf": "2.0.2",
    "chai": "4.2.0",
    "commander": "2.20.0",
-    "conventional-changelog-cli": "2.0.12",
+    "conventional-changelog-cli": "2.0.21",
    "mocha": "6.1.4",
    "mocha-typescript": "1.1.17",
-    "nyc": "14.0.0",
+    "nyc": "14.1.1",
    "rimraf": "2.6.3",
+    "source-map-support": "0.5.12",
    "ts-node": "8.1.0",
-    "tslint": "5.15.0",
+    "tslint": "5.16.0",
    "typedoc": "0.14.2",
-    "typescript": "3.4.3"
+    "typescript": "3.4.5"
  },
  "nyc": {
    "check-coverage": true,
@@ -70,7 +71,7 @@
    "lines": 95,
    "statements": 95,
    "functions": 95,
-    "branches": 95,
+    "branches": 85,
    "include": [
      "src/core/Route.ts",
      "src/core/Thing.ts",
@@ -85,5 +86,10 @@
      "text-summary"
    ],
    "all": true
+  },
+  "openstappsConfiguration": {
+    "hasCli": false,
+    "standardBuild": false,
+    "standardDocumentation": false
  }
 }
--- a/src/core/Route.ts
+++ b/src/core/Route.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/Thing.ts
+++ b/src/core/Thing.ts
@@ -12,8 +12,8 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCOrganization} from './things/Organization';
-import {SCPerson} from './things/Person';
+import {SCOrganizationWithoutReferences} from './things/Organization';
+import {SCPersonWithoutReferences} from './things/Person';
 import {SCMetaTranslations, SCTranslations} from './types/i18n';
 import {SCISO8601Date} from './types/Time';
 import {SCUuid} from './types/UUID';
@@ -49,9 +49,9 @@ export enum SCThingType {
 }

 /**
- * A thing
+ * A thing without references
 */
-export interface SCThing {
+export interface SCThingWithoutReferences {
  /**
   * Alternate names of the thing
   */
@@ -63,7 +63,7 @@ export interface SCThing {
   */
  description?: string;
  /**
-   * Image of the thing
+   * URL of an image of the thing
   */
  image?: string;
  /**
@@ -72,10 +72,6 @@ export interface SCThing {
   * @minLength 1
   */
  name: string;
-  /**
-   * Origin of the thing
-   */
-  origin: SCThingRemoteOrigin | SCThingUserOrigin;
  /**
   * Translations of specific values of the object
   *
@@ -96,6 +92,16 @@ export interface SCThing {
  url?: string;
 }

+/**
+ * A thing
+ */
+export interface SCThing extends SCThingWithoutReferences {
+  /**
+   * Origin of the thing
+   */
+  origin: SCThingRemoteOrigin | SCThingUserOrigin;
+}
+
 /**
 * Possible types of an origin
 */
@@ -113,7 +119,7 @@ export interface SCThingOrigin {
   *
   * e.g. restaurant of a dish
   */
-  maintainer?: SCPerson | SCOrganization;
+  maintainer?: SCPersonWithoutReferences | SCOrganizationWithoutReferences;

  /**
   * When the thing was modified last in the origin
@@ -150,7 +156,7 @@ export interface SCThingRemoteOrigin extends SCThingOrigin {
   *
   * e.g. an organizer for an event
   */
-  responsibleEntity?: SCPerson | SCOrganization;
+  responsibleEntity?: SCPersonWithoutReferences | SCOrganizationWithoutReferences;

  /**
   * Type of the origin
@@ -256,7 +262,7 @@ export class SCThingMeta implements SCMetaTranslations<SCThing> {
  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
      type: 'Ding',
    },
@@ -275,5 +281,6 @@ export class SCThingMeta implements SCMetaTranslations<SCThing> {
    return this._instance.get(this.name) as T;
  }

-  protected constructor() {}
+  protected constructor() {
+  }
 }
--- a/src/core/base/AcademicDegree.ts
+++ b/src/core/base/AcademicDegree.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,39 +12,46 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing} from '../Thing';
-import {SCThingMeta} from '../Thing';
+import {SCThing, SCThingMeta, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';

 /**
 * An academic degree without references
 */
-export interface SCAcademicDegreeWithoutReferences extends SCThing {
+export interface SCAcademicDegreeWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * The achievable academic degree
   */
  academicDegree: SCGermanAcademicDegree;

  /**
-   * The achievable academic degree with academic field specification 
+   * The achievable academic degree with academic field specification
   * (eg. Master of Science)
   */
  academicDegreewithField: string;

  /**
-   * The achievable academic degree with academic field specification 
+   * The achievable academic degree with academic field specification
   * shorted (eg. M.Sc.).
   */
  academicDegreewithFieldShort: string;
 }

-export interface SCAcademicDegree extends SCAcademicDegreeWithoutReferences {
+/**
+ * An academic degree
+ */
+export interface SCAcademicDegree
+  extends SCAcademicDegreeWithoutReferences, SCThing {
+  // noop
 }

 /**
 * Meta information about academic degrees
 */
-export class SCAcademicDegreeMeta extends SCThingMeta implements SCMetaTranslations<SCAcademicDegree> {
+export class SCAcademicDegreeMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCAcademicDegree> {
  /**
   * Translations of fields
   */
@@ -86,11 +93,12 @@ export class SCAcademicDegreeMeta extends SCThingMeta implements SCMetaTranslati
 /**
 * Types of (german) academic degrees
 */
-export type SCGermanAcademicDegree = 'bachelor' |
-                                     'diploma' |
-                                     'doctor' |
-                                     'licentiate' |
-                                     'magister' |
-                                     'master' |
-                                     'master pupil' |
-                                     'state examination' ;
+export type SCGermanAcademicDegree =
+  'bachelor'
+  | 'diploma'
+  | 'doctor'
+  | 'licentiate'
+  | 'magister'
+  | 'master'
+  | 'master pupil'
+  | 'state examination' ;
--- a/src/core/base/AcademicTerm.ts
+++ b/src/core/base/AcademicTerm.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,14 +12,15 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta} from '../Thing';
+import {SCThing, SCThingMeta, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';
 import {SCISO8601Date} from '../types/Time';

 /**
 * An academic term without references
 */
-export interface SCAcademicTermWithoutReferences extends SCThing {
+export interface SCAcademicTermWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Short name of the academic term, using the given pattern
   */
@@ -46,31 +47,40 @@ export interface SCAcademicTermWithoutReferences extends SCThing {
  startDate: SCISO8601Date;
 }

+/**
+ * An academic term
+ */
+export interface SCAcademicTerm
+  extends SCAcademicTermWithoutReferences, SCThing {
+  // noop
+}
+
 /**
 * Meta information about academic terms
 */
-export class SCAcademicTermWithoutReferencesMeta extends SCThingMeta implements SCMetaTranslations<SCThing> {
+export class SCAcademicTermWithoutReferencesMeta
+  extends SCThingMeta implements SCMetaTranslations<SCThing> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/CreativeWork.ts
+++ b/src/core/base/CreativeWork.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta, SCThingTranslatableProperties} from '../Thing';
+import {SCThingMeta, SCThingTranslatableProperties, SCThingWithoutReferences} from '../Thing';
 import {SCOrganizationWithoutReferences} from '../things/Organization';
 import {SCPersonWithoutReferences} from '../things/Person';
 import {SCLanguage, SCMetaTranslations, SCTranslations} from '../types/i18n';
@@ -21,12 +21,14 @@ import {
  SCAcademicPriceGroup,
  SCThingThatCanBeOffered,
  SCThingThatCanBeOfferedTranslatableProperties,
+  SCThingThatCanBeOfferedWithoutReferences,
 } from './ThingThatCanBeOffered';

 /**
 * A creative work without references
 */
-export interface SCCreativeWorkWithoutReferences extends SCThing {
+export interface SCCreativeWorkWithoutReferences
+  extends SCThingWithoutReferences, SCThingThatCanBeOfferedWithoutReferences {
  /**
   * Date the creative work was published
   */
@@ -51,7 +53,8 @@ export interface SCCreativeWorkWithoutReferences extends SCThing {
 /**
 * A creative work
 */
-export interface SCCreativeWork extends SCCreativeWorkWithoutReferences, SCThingThatCanBeOffered<SCAcademicPriceGroup> {
+export interface SCCreativeWork
+  extends SCCreativeWorkWithoutReferences, SCThingThatCanBeOffered<SCAcademicPriceGroup> {
  /**
   * Authors of the creative work
   */
@@ -82,28 +85,29 @@ export interface SCCreativeWorkTranslatableProperties
 /**
 * Meta information about creative works
 */
-export class SCCreativeWorkMeta extends SCThingMeta implements SCMetaTranslations<SCCreativeWork> {
+export class SCCreativeWorkMeta
+  extends SCThingMeta implements SCMetaTranslations<SCCreativeWork> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/Event.ts
+++ b/src/core/base/Event.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta} from '../Thing';
+import {SCThing, SCThingMeta, SCThingWithoutReferences} from '../Thing';
 import {SCCatalogWithoutReferences} from '../things/Catalog';
 import {SCPersonWithoutReferences} from '../things/Person';
 import {SCSemesterWithoutReferences} from '../things/Semester';
@@ -22,7 +22,8 @@ import {SCCreativeWorkWithoutReferences} from './CreativeWork';
 /**
 * An event without references
 */
-export interface SCEventWithoutReferences extends SCThing {
+export interface SCEventWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Maximum number of participants of the event
   *
@@ -41,7 +42,8 @@ export interface SCEventWithoutReferences extends SCThing {
 /**
 * An event
 */
-export interface SCEvent extends SCEventWithoutReferences {
+export interface SCEvent
+  extends SCEventWithoutReferences, SCThing {
  /**
   * Academic terms that an event belongs to, e.g. semester(s).
   */
@@ -73,28 +75,29 @@ export interface SCEvent extends SCEventWithoutReferences {
 /**
 * Meta information about events
 */
-export class SCEventMeta extends SCThingMeta implements SCMetaTranslations<SCEvent> {
+export class SCEventMeta
+  extends SCThingMeta implements SCMetaTranslations<SCEvent> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/Place.ts
+++ b/src/core/base/Place.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta, SCThingTranslatableProperties} from '../Thing';
+import {SCThing, SCThingMeta, SCThingTranslatableProperties, SCThingWithoutReferences} from '../Thing';
 import {SCGeoInformation} from '../types/GeoInformation';
 import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCPostalAddress} from '../types/PostalAddress';
@@ -20,7 +20,8 @@ import {SCPostalAddress} from '../types/PostalAddress';
 /**
 * A place without references
 */
-export interface SCPlaceWithoutReferences extends SCThing {
+export interface SCPlaceWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Address of the place
   */
@@ -44,38 +45,53 @@ export interface SCPlaceWithoutReferences extends SCThing {
   * Translated fields of a place
   */
  translations?: SCTranslations<SCPlaceWithoutReferencesTranslatableProperties>;
-
 }

-export interface SCPlaceWithoutReferencesTranslatableProperties extends SCThingTranslatableProperties {
+/**
+ * A place
+ */
+export interface SCPlace
+  extends SCPlaceWithoutReferences, SCThing {
+  /**
+   * Translated fields of a place
+   */
+  translations?: SCTranslations<SCPlaceWithoutReferencesTranslatableProperties>;
+}
+
+/**
+ * Translatable properties of a place without references
+ */
+export interface SCPlaceWithoutReferencesTranslatableProperties
+  extends SCThingTranslatableProperties {
  address?: SCPostalAddress;
 }

 /**
 * Meta information about creative works
 */
-export class SCPlaceWithoutReferencesMeta extends SCThingMeta implements SCMetaTranslations<SCPlaceWithoutReferences> {
+export class SCPlaceWithoutReferencesMeta
+  extends SCThingMeta implements SCMetaTranslations<SCPlaceWithoutReferences> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/SaveableThing.ts
+++ b/src/core/base/SaveableThing.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018, 2019 StApps
+ * Copyright (C) 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,24 +12,27 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingUserOrigin} from '../Thing';
+import {SCThing, SCThingUserOrigin, SCThingWithoutReferences} from '../Thing';

 /**
 * An encapsulation of the data (e.g. a thing) that is saved, which provides additional information.
 */
-export interface SCSaveableThingWithoutReferences extends SCThing {
+export interface SCSaveableThingWithoutReferences
+  extends SCThingWithoutReferences {
+  // noop
+}
+
+/**
+ * An encapsulation of the data (e.g. a thing) that is saved, which provides additional information.
+ */
+export interface SCSaveableThing<T extends SCThingWithoutReferences>
+  extends SCSaveableThingWithoutReferences, SCThing {
+  /**
+   * The contained data
+   */
+  data: T;
  /**
   * Type of the origin
   */
  origin: SCThingUserOrigin;
 }
-
-/**
- * An encapsulation of the data (e.g. a thing) that is saved, which provides additional information.
- */
-export interface SCSaveableThing<T extends SCThing> extends SCSaveableThingWithoutReferences {
-  /**
-   * The contained data
-   */
-  data: T;
-}
--- a/src/core/base/ThingInPlace.ts
+++ b/src/core/base/ThingInPlace.ts
@@ -19,22 +19,26 @@ import {SCInPlace} from '../types/Places';
 /**
 * A thing that is or happens in a place
 */
-export interface SCThingInPlace extends SCThing, SCInPlace {}
+export interface SCThingInPlace
+  extends SCThing, SCInPlace {
+  // noop
+}

 /**
 * Meta information about thing in a place
 */
-export class SCThingInPlaceMeta extends SCThingMeta implements SCMetaTranslations<SCThingInPlace> {
+export class SCThingInPlaceMeta
+  extends SCThingMeta implements SCMetaTranslations<SCThingInPlace> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
      inPlace: 'Ort',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
      inPlace: 'location',
    },
  };
@@ -42,12 +46,12 @@ export class SCThingInPlaceMeta extends SCThingMeta implements SCMetaTranslation
  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/ThingThatAcceptsPayments.ts
+++ b/src/core/base/ThingThatAcceptsPayments.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta} from '../Thing';
+import {SCThing, SCThingMeta, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';

 /**
@@ -24,41 +24,50 @@ export type SCThingThatAcceptsPaymentsAcceptedPayments =
  | 'Cafeteria Card';

 /**
- * A place without references that accepts payments
+ * A thing without references that accepts payments
 */
-export interface SCThingThatAcceptsPaymentsWithoutReferences extends SCThing {
+export interface SCThingThatAcceptsPaymentsWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Accepted payments of the place
   */
  paymentsAccepted?: SCThingThatAcceptsPaymentsAcceptedPayments[];
 }

+/**
+ * A thing that accepts payments
+ */
+export interface SCThingThatAcceptsPayments
+  extends SCThingThatAcceptsPaymentsWithoutReferences, SCThing {
+  // noop
+}
+
 /**
 * Meta information about a thing without references that accepts payments
 */
-export class SCThingThatAcceptsPaymentsWithoutReferencesMeta extends SCThingMeta implements
-             SCMetaTranslations<SCThingThatAcceptsPaymentsWithoutReferences> {
+export class SCThingThatAcceptsPaymentsWithoutReferencesMeta
+  extends SCThingMeta implements SCMetaTranslations<SCThingThatAcceptsPaymentsWithoutReferences> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };
 }
--- a/src/core/base/ThingThatCanBeOffered.ts
+++ b/src/core/base/ThingThatCanBeOffered.ts
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingTranslatableProperties} from '../Thing';
+import {SCThing, SCThingTranslatableProperties, SCThingWithoutReferences} from '../Thing';
 import {SCOrganizationWithoutReferences} from '../things/Organization';
 import {SCPersonWithoutReferences} from '../things/Person';
 import {SCTranslations} from '../types/i18n';
@@ -32,7 +32,8 @@ export interface SCPriceGroup {
 /**
 * Price distinctions for academic context
 */
-export interface SCAcademicPriceGroup extends SCPriceGroup {
+export interface SCAcademicPriceGroup
+  extends SCPriceGroup {
  /**
   * Price for employees
   */
@@ -52,7 +53,8 @@ export interface SCAcademicPriceGroup extends SCPriceGroup {
 /**
 * A thing without references that can be offered
 */
-export interface SCThingThatCanBeOfferedWithoutReferences extends SCThing {
+export interface SCThingThatCanBeOfferedWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Translations of a thing that can be offered
   */
@@ -63,11 +65,16 @@ export interface SCThingThatCanBeOfferedWithoutReferences extends SCThing {
 * A thing that can be offered
 */
 export interface SCThingThatCanBeOffered<T extends SCPriceGroup>
-  extends SCThing {
+  extends SCThing, SCThingThatCanBeOfferedWithoutReferences {
  /**
   * List of offers for that thing
   */
  offers?: Array<SCThingThatCanBeOfferedOffer<T>>;
+
+  /**
+   * Translations of a thing that can be offered
+   */
+  translations?: SCTranslations<SCThingThatCanBeOfferedTranslatableProperties>;
 }

 /**
--- a/src/core/base/ThingWithCategories.ts
+++ b/src/core/base/ThingWithCategories.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta, SCThingTranslatableProperties} from '../Thing';
+import {SCThing, SCThingMeta, SCThingTranslatableProperties, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCMap} from '../types/Map';

@@ -22,9 +22,8 @@ import {SCMap} from '../types/Map';
 * !!! BEWARE !!!
 * `T` should be a union type - e.g. `T = 'foo' | 'bar' | 'foobar';`
 */
-export interface SCThingWithCategoriesWithoutReferences<T,
-  U extends SCThingWithCategoriesSpecificValues>
-  extends SCThing {
+export interface SCThingWithCategoriesWithoutReferences<T, U extends SCThingWithCategoriesSpecificValues>
+  extends SCThingWithoutReferences {
  /**
   * Categories of a thing with categories
   */
@@ -43,10 +42,22 @@ export interface SCThingWithCategoriesWithoutReferences<T,
  translations?: SCTranslations<SCThingWithCategoriesTranslatableProperties>;
 }

+/**
+ * A thing with categories
+ */
+export interface SCThingWithCategories<T, U extends SCThingWithCategoriesSpecificValues>
+  extends SCThing, SCThingWithCategoriesWithoutReferences<T, U> {
+  /**
+   * Translated fields of a thing with categories
+   */
+  translations?: SCTranslations<SCThingWithCategoriesTranslatableProperties>;
+}
+
 /**
 * Translatable properties of a thing with categories
 */
-export interface SCThingWithCategoriesTranslatableProperties extends SCThingTranslatableProperties {
+export interface SCThingWithCategoriesTranslatableProperties
+  extends SCThingTranslatableProperties {
  /**
   * translations of the categories of a thing with categories
   */
@@ -70,7 +81,7 @@ export interface SCThingWithCategoriesSpecificValues {
  description?: string;

  /**
-   * Category specific image of a thing
+   * URL of a category specific image of a thing
   */
  image?: string;

@@ -88,8 +99,8 @@ export interface SCThingWithCategoriesSpecificValues {
 /**
 * Meta information about a thing without references that accepts payments
 */
-export class SCThingWithCategoriesWithoutReferencesMeta<T, U> implements
-             SCMetaTranslations<SCThingWithCategoriesWithoutReferences<T, U>> {
+export class SCThingWithCategoriesWithoutReferencesMeta<T, U>
+  implements SCMetaTranslations<SCThingWithCategoriesWithoutReferences<T, U>> {

  protected static _instance: SCThingMeta;

@@ -98,22 +109,22 @@ export class SCThingWithCategoriesWithoutReferencesMeta<T, U> implements
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
    },
  };

--- a/src/core/base/ThingWithTranslations.ts
+++ b/src/core/base/ThingWithTranslations.ts
@@ -1,23 +0,0 @@
-/*
- * Copyright (C) 2018 StApps
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, version 3.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-import {SCThing, SCThingTranslatableProperties} from '../Thing';
-import {SCTranslations} from '../types/i18n';
-
-/**
- * A thing that has translations
- */
-export interface SCThingWithTranslations extends SCThing {
-  translations: SCTranslations<SCThingTranslatableProperties>;
-}
--- a/src/core/files/ConfigFile.ts
+++ b/src/core/files/ConfigFile.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/INDEX/IndexResponse.ts
+++ b/src/core/protocol/routes/INDEX/IndexResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/TYPE/UID/ThingUpdateResponse.ts
+++ b/src/core/protocol/routes/TYPE/UID/ThingUpdateResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/bookAvailability/BookAvailabilityResponse.ts
+++ b/src/core/protocol/routes/bookAvailability/BookAvailabilityResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/bulk/BulkResponse.ts
+++ b/src/core/protocol/routes/bulk/BulkResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/bulk/UID/BulkAddResponse.ts
+++ b/src/core/protocol/routes/bulk/UID/BulkAddResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/bulk/UID/BulkDoneResponse.ts
+++ b/src/core/protocol/routes/bulk/UID/BulkDoneResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/feedback/FeedbackResponse.ts
+++ b/src/core/protocol/routes/feedback/FeedbackResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/protocol/routes/plugin/PluginRegisterRequest.ts
+++ b/src/core/protocol/routes/plugin/PluginRegisterRequest.ts
@@ -29,40 +29,27 @@ import {
 *
 * @validatable
 */
-export type SCPluginRegisterRequest = AddPlugin | RemovePlugin;
-interface AddPlugin {
+export type SCPluginRegisterRequest = SCPluginAdd | SCPluginRemove;
+
+/**
+ * Plugin request for adding a plugin registration to the backend
+ */
+export interface SCPluginAdd {
  /**
   * The desired action, so whether the plugin should be added or removed
   */
  action: 'add';

  /**
-   * The address of the plugin
+   * Plugin information needed for its registration
   */
-  address: string;
-
-  /**
-   * The name of the plugin
-   * Just for debugging purposes, to more easily identify conflicts.
-   */
-  name: string;
-
-  /**
-   * How the requests of the plugin looks like, a JSON schema for validation
-   */
-  pluginRequestSchema: Schema;
-
-  /**
-   * How the responses of the plugin looks like, a JSON schema for validation
-   */
-  pluginResponseSchema: Schema;
-
-  /**
-   * The desired route, for example /feedback.
-   */
-  route: string;
+  plugin: SCPluginMetaData;
 }
-interface RemovePlugin {
+
+/**
+ * Plugin request for removing a plugin registration from the backend
+ */
+export interface SCPluginRemove {
  /**
   * The desired action, so whether the plugin should be added or removed
   */
@@ -74,6 +61,36 @@ interface RemovePlugin {
  route: string;
 }

+/**
+ * Plugin meta data - contains needed information for a plugin registration
+ */
+export interface SCPluginMetaData {
+  /**
+   * The address of the plugin, to which the backend routes the requests
+   */
+  address: string;
+
+  /**
+   * The name of the plugin (for debugging purposes, to more easily identify conflicts)
+   */
+  name: string;
+
+  /**
+   * How the requests of the plugin looks like, a JSON schema for validation
+   */
+  requestSchema: Schema;
+
+  /**
+   * How the responses of the plugin looks like, a JSON schema for validation
+   */
+  responseSchema: Schema;
+
+  /**
+   * The desired route, for example /feedback.
+   */
+  route: string;
+}
+
 /**
 * Route to register plugins
 */
@@ -85,7 +102,6 @@ export class SCPluginRegisterRoute extends SCAbstractRoute {
      SCMethodNotAllowedErrorResponse,
      SCParametersNotAcceptable,
      SCPluginAlreadyRegisteredErrorResponse,
-      SCPluginRouteAlreadyRegisteredErrorResponse,
      SCPluginRegisteringFailedErrorResponse,
      SCPluginRouteAlreadyRegisteredErrorResponse,
      SCRequestBodyTooLargeErrorResponse,
--- a/src/core/protocol/routes/search/SearchResponse.ts
+++ b/src/core/protocol/routes/search/SearchResponse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/things/AcademicEvent.ts
+++ b/src/core/things/AcademicEvent.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -14,6 +14,7 @@
 */
 import {SCEvent, SCEventMeta, SCEventWithoutReferences} from '../base/Event';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -27,8 +28,7 @@ import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 */
 export interface SCAcademicEventWithoutReferences
  extends SCEventWithoutReferences,
-    SCThingWithCategoriesWithoutReferences<SCAcademicEventCategories,
-      SCThingWithCategoriesSpecificValues> {
+    SCThingWithCategoriesWithoutReferences<SCAcademicEventCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Majors of the academic event that this event belongs to
   */
@@ -55,7 +55,9 @@ export interface SCAcademicEventWithoutReferences
 *
 * @validatable
 */
-export interface SCAcademicEvent extends SCEvent, SCAcademicEventWithoutReferences {
+export interface SCAcademicEvent
+  extends SCEvent, SCAcademicEventWithoutReferences,
+    SCThingWithCategories<SCAcademicEventCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Translated fields of an academic event
   */
@@ -104,37 +106,39 @@ export interface SCAcademicEventTranslatableProperties
 /**
 * Meta information about academic events
 */
-export class SCAcademicEventMeta extends SCThingMeta implements SCMetaTranslations<SCAcademicEvent> {
+export class SCAcademicEventMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCAcademicEvent> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCEventMeta.getInstance().fieldTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCEventMeta.getInstance().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
    },
    en: {
-      ... SCEventMeta.getInstance().fieldTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCEventMeta.getInstance().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCEventMeta.getInstance().fieldValueTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCEventMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
      type: 'akademische Veranstaltung',
    },
    en: {
-      ... SCEventMeta.getInstance().fieldValueTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCEventMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCAcademicEventCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
      type: SCThingType.AcademicEvent,
    },
  };
--- a/src/core/things/Article.ts
+++ b/src/core/things/Article.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -19,6 +19,7 @@ import {
  SCCreativeWorkWithoutReferences,
 } from '../base/CreativeWork';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -32,8 +33,7 @@ import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 */
 export interface SCArticleWithoutReferences
  extends SCCreativeWorkWithoutReferences,
-    SCThingWithCategoriesWithoutReferences<SCArticleCategories,
-      SCThingWithCategoriesSpecificValues> {
+    SCThingWithCategoriesWithoutReferences<SCArticleCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Article itself as markdown
   */
@@ -55,7 +55,9 @@ export interface SCArticleWithoutReferences
 *
 * @validatable
 */
-export interface SCArticle extends SCCreativeWork, SCArticleWithoutReferences {
+export interface SCArticle
+  extends SCCreativeWork, SCArticleWithoutReferences,
+    SCThingWithCategories<SCArticleCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Translated fields of an article
   */
@@ -86,37 +88,38 @@ export interface SCArticleTranslatableProperties
 /**
 * Meta information about an article
 */
-export class SCArticleMeta extends SCThingMeta implements SCMetaTranslations<SCArticle> {
+export class SCArticleMeta
+  extends SCThingMeta implements SCMetaTranslations<SCArticle> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
      type: 'Artikel',
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCArticleCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
      type: SCThingType.Article,
    },
  };
--- a/src/core/things/Book.ts
+++ b/src/core/things/Book.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -26,7 +26,8 @@ import {SCPersonWithoutReferences} from './Person';
 /**
 * A book without references
 */
-export interface SCBookWithoutReferences extends SCCreativeWorkWithoutReferences {
+export interface SCBookWithoutReferences
+  extends SCCreativeWorkWithoutReferences {
  /**
   * Edition of a book
   */
@@ -58,7 +59,8 @@ export interface SCBookWithoutReferences extends SCCreativeWorkWithoutReferences
 *
 * @validatable
 */
-export interface SCBook extends SCCreativeWork, SCBookWithoutReferences {
+export interface SCBook
+  extends SCCreativeWork, SCBookWithoutReferences {
  /**
   * Authors of the creative work
   */
@@ -95,23 +97,23 @@ export class SCBookMeta extends SCThingMeta implements SCMetaTranslations<SCBook
   */
  fieldTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
      type: 'Buch',
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Book,
    },
  };
--- a/src/core/things/Building.ts
+++ b/src/core/things/Building.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -13,11 +13,13 @@
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
 import {
+  SCPlace,
  SCPlaceWithoutReferences,
  SCPlaceWithoutReferencesMeta,
  SCPlaceWithoutReferencesTranslatableProperties,
 } from '../base/Place';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -37,8 +39,7 @@ export type SCBuildingCategories =
  | 'restroom';

 export interface SCBuildingWithoutReferences
-  extends SCThingWithCategoriesWithoutReferences<SCBuildingCategories,
-    SCThingWithCategoriesSpecificValues>,
+  extends SCThingWithCategoriesWithoutReferences<SCBuildingCategories, SCThingWithCategoriesSpecificValues>,
    SCPlaceWithoutReferences {
  /**
   * Categories of a building
@@ -66,7 +67,9 @@ export interface SCBuildingWithoutReferences
 *
 * @validatable
 */
-export interface SCBuilding extends SCBuildingWithoutReferences {
+export interface SCBuilding
+  extends SCBuildingWithoutReferences, SCPlace,
+    SCThingWithCategories<SCBuildingCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Translated fields of a building
   */
@@ -79,39 +82,41 @@ export interface SCBuilding extends SCBuildingWithoutReferences {
 }

 export interface SCBuildingTranslatableProperties
-       extends SCPlaceWithoutReferencesTranslatableProperties, SCThingWithCategoriesTranslatableProperties {
+  extends SCPlaceWithoutReferencesTranslatableProperties, SCThingWithCategoriesTranslatableProperties {
  floors?: string[];
 }

-  /**
-   * Meta information about a place
-   */
-export class SCBuildingMeta extends SCThingMeta implements SCMetaTranslations<SCBuilding> {
+/**
+ * Meta information about a place
+ */
+export class SCBuildingMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCBuilding> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
      floors: 'Etagen',
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
      categories: {
        'cafe': 'Café',
        'canteen': 'Kantine',
@@ -125,9 +130,9 @@ export class SCBuildingMeta extends SCThingMeta implements SCMetaTranslations<SC
      type: 'Gebäude',
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCBuildingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Building,
    },
  };
--- a/src/core/things/Catalog.ts
+++ b/src/core/things/Catalog.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -14,19 +14,20 @@
 */
 import {SCAcademicTermWithoutReferences} from '../base/AcademicTerm';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
+  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
  SCThingWithCategoriesWithoutReferencesMeta,
 } from '../base/ThingWithCategories';
-import {SCThingMeta, SCThingType} from '../Thing';
-import {SCMetaTranslations} from '../types/i18n';
+import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCMetaTranslations, SCTranslations} from '../types/i18n';

 /**
 * A catalog without references
 */
 export interface SCCatalogWithoutReferences
-  extends SCThingWithCategoriesWithoutReferences<SCCatalogCategories,
-    SCThingWithCategoriesSpecificValues> {
+  extends SCThingWithCategoriesWithoutReferences<SCCatalogCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Level of the catalog (0 for 'root catalog', 1 for its subcatalog, 2 for its subcatalog etc.)
   *
@@ -45,7 +46,9 @@ export interface SCCatalogWithoutReferences
 *
 * @validatable
 */
-export interface SCCatalog extends SCCatalogWithoutReferences {
+export interface SCCatalog
+  extends SCCatalogWithoutReferences, SCThing,
+    SCThingWithCategories<SCCatalogCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Academic term that a catalog belongs to (e.g. semester)
   */
@@ -61,42 +64,48 @@ export interface SCCatalog extends SCCatalogWithoutReferences {
   */
  superCatalogs?: SCCatalogWithoutReferences[];

+  /**
+   * Translated fields of a catalog
+   */
+  translations?: SCTranslations<SCThingWithCategoriesTranslatableProperties>;
+
  /**
   * Type of a catalog
   */
  type: SCThingType.Catalog;
 }

-  /**
-   * Catalog meta data
-   */
-export class SCCatalogMeta extends SCThingMeta implements SCMetaTranslations<SCCatalog> {
+/**
+ * Catalog meta data
+ */
+export class SCCatalogMeta
+  extends SCThingMeta implements SCMetaTranslations<SCCatalog> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
      type: 'Verzeichnis',
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCCatalogCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
      type: SCThingType.Catalog,
    },
  };
--- a/src/core/things/CourseOfStudies.ts
+++ b/src/core/things/CourseOfStudies.ts
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCAcademicDegree, SCAcademicDegreeMeta} from '../base/AcademicDegree';
+import {SCAcademicDegree, SCAcademicDegreeMeta, SCAcademicDegreeWithoutReferences} from '../base/AcademicDegree';
 import {
  SCAcademicPriceGroup,
  SCThingThatCanBeOffered,
@@ -22,13 +22,13 @@ import {
 import {SCThingMeta, SCThingType} from '../Thing';
 import {SCLanguage, SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCDateSeriesWithoutReferences} from './DateSeries';
-import {SCOrganization} from './Organization';
+import {SCOrganizationWithoutReferences} from './Organization';

 /**
 * A course of studies without references
 */
-export interface SCCourseOfStudiesWithoutReferences extends SCAcademicDegree,
-  SCThingThatCanBeOfferedWithoutReferences {
+export interface SCCourseOfStudiesWithoutReferences
+  extends SCAcademicDegreeWithoutReferences, SCThingThatCanBeOfferedWithoutReferences {
  /**
   * The main language in which the course of studies
   * is beeing offered
@@ -66,18 +66,18 @@ export interface SCCourseOfStudiesWithoutReferences extends SCAcademicDegree,
 *
 * @validatable
 */
-export interface SCCourseOfStudies extends SCCourseOfStudiesWithoutReferences,
-  SCThingThatCanBeOffered<SCAcademicPriceGroup> {
+export interface SCCourseOfStudies
+  extends SCCourseOfStudiesWithoutReferences, SCThingThatCanBeOffered<SCAcademicPriceGroup>, SCAcademicDegree {
  /**
   * The department that manages the course of studies
   */
-  department: SCOrganization;
+  department: SCOrganizationWithoutReferences;

  /**
   * The secretary that administers requests and
   * questions concerning the course of studies
   */
-  secretary: SCOrganization;
+  secretary: SCOrganizationWithoutReferences;

  /**
   * Dates at which the course of studies is planned to start
@@ -85,7 +85,7 @@ export interface SCCourseOfStudies extends SCCourseOfStudiesWithoutReferences,
  startDates?: SCDateSeriesWithoutReferences[];

  /**
-   * Translated fields of a dish
+   * Translated fields of a course of studies
   */
  translations?: SCTranslations<SCCourseOfStudiesTranslatableProperties>;

@@ -95,14 +95,20 @@ export interface SCCourseOfStudies extends SCCourseOfStudiesWithoutReferences,
  type: SCThingType.CourseOfStudies;
 }

+/**
+ * Translatable properties of a course of studies
+ */
 export interface SCCourseOfStudiesTranslatableProperties
  extends SCThingThatCanBeOfferedTranslatableProperties {
+  // noop
 }

 /**
 * Meta information about a course of studies
 */
-export class SCCourseOfStudiesMeta extends SCThingMeta implements SCMetaTranslations<SCCourseOfStudies> {
+export class SCCourseOfStudiesMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCCourseOfStudies> {
  /**
   * Translations of fields
   */
--- a/src/core/things/DateSeries.ts
+++ b/src/core/things/DateSeries.ts
@@ -29,7 +29,8 @@ import {SCSportCourseWithoutReferences} from './SportCourse';
 /**
 * Price groups for sport courses
 */
-export interface SCSportCoursePriceGroup extends SCAcademicPriceGroup {
+export interface SCSportCoursePriceGroup
+  extends SCAcademicPriceGroup {
  /**
   * Price for alumnis
   */
@@ -39,7 +40,8 @@ export interface SCSportCoursePriceGroup extends SCAcademicPriceGroup {
 /**
 * A date without references
 */
-export interface SCDateSeriesWithoutReferences extends SCThingThatCanBeOfferedWithoutReferences {
+export interface SCDateSeriesWithoutReferences
+  extends SCThingThatCanBeOfferedWithoutReferences {
  /**
   * Dates of the date series that are initially planned to be held
   */
@@ -76,9 +78,10 @@ export interface SCDateSeriesWithoutReferences extends SCThingThatCanBeOfferedWi
 *
 * @validatable
 */
-export interface SCDateSeries extends SCDateSeriesWithoutReferences,
-  SCThingInPlace,
-  SCThingThatCanBeOffered<SCSportCoursePriceGroup> {
+export interface SCDateSeries
+  extends SCDateSeriesWithoutReferences,
+    SCThingInPlace,
+    SCThingThatCanBeOffered<SCSportCoursePriceGroup> {
  /**
   * Event to which the date series belongs
   */
@@ -104,7 +107,9 @@ export interface SCDateSeries extends SCDateSeriesWithoutReferences,
 /**
 * Meta information about a date series
 */
-export class SCDateSeriesMeta extends SCThingMeta implements SCMetaTranslations<SCDateSeries> {
+export class SCDateSeriesMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCDateSeries> {
  /**
   * Translations of fields
   */
--- a/src/core/things/Diff.ts
+++ b/src/core/things/Diff.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -14,14 +14,15 @@
 */
 import * as jsonpatch from 'json-patch';
 import {SCThingsWithoutDiff} from '../Classes';
-import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCThing, SCThingMeta, SCThingType, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';
 import {SCISO8601Date} from '../types/Time';

 /**
 * A diff without references
 */
-export interface SCDiffWithoutReferences extends SCThing {
+export interface SCDiffWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Action of the diff
   */
@@ -48,7 +49,8 @@ export interface SCDiffWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCDiff extends SCDiffWithoutReferences {
+export interface SCDiff
+  extends SCDiffWithoutReferences, SCThing {
  /**
   * Original object the diff was generated on
   */
@@ -63,32 +65,34 @@ export interface SCDiff extends SCDiffWithoutReferences {
 /**
 * Meta information about a diff
 */
-export class SCDiffMeta extends SCThingMeta implements SCMetaTranslations<SCDiff> {
+export class SCDiffMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCDiff> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
      action: 'Aktion',
      changes: 'Änderungen',
      dateCreated: 'Erstellungsdatum',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
      type: 'Unterschied',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Diff,
    },
  };
--- a/src/core/things/Dish.ts
+++ b/src/core/things/Dish.ts
@@ -19,6 +19,7 @@ import {
  SCThingThatCanBeOfferedWithoutReferences,
 } from '../base/ThingThatCanBeOffered';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -30,8 +31,9 @@ import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 /**
 * A dish without references
 */
-export interface SCDishWithoutReferences extends SCThingThatCanBeOfferedWithoutReferences,
-  SCThingWithCategoriesWithoutReferences<SCDishCategories, SCThingWithCategoriesSpecificValues> {
+export interface SCDishWithoutReferences
+  extends SCThingThatCanBeOfferedWithoutReferences,
+    SCThingWithCategoriesWithoutReferences<SCDishCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Additives of the dish
   */
@@ -68,8 +70,9 @@ export interface SCDishWithoutReferences extends SCThingThatCanBeOfferedWithoutR
 *
 * @validatable
 */
-export interface SCDish extends SCDishWithoutReferences,
-  SCThingThatCanBeOffered<SCAcademicPriceGroup> {
+export interface SCDish
+  extends SCDishWithoutReferences, SCThingThatCanBeOffered<SCAcademicPriceGroup>,
+    SCThingWithCategories<SCDishCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Dishes ("Beilagen") that are served with the dish (if only certain supplement dishes can be taken with a dish)
   */
@@ -99,7 +102,7 @@ export interface SCDishTranslatableProperties
 */
 export interface SCDishCharacteristic {
  /**
-   * URL to the image of the characteristic
+   * URL of an image of the characteristic
   */
  image?: string;

@@ -165,7 +168,9 @@ export interface SCNutritionInformation {
 /**
 * Meta information about a dish
 */
-export class SCDishMeta extends SCThingMeta implements SCMetaTranslations<SCDish> {
+export class SCDishMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCDish> {
  /**
   * Translations of fields
   */
--- a/src/core/things/Favorite.ts
+++ b/src/core/things/Favorite.ts
@@ -40,8 +40,9 @@ export type SCFavoriteDataTypes = SCAcademicEventWithoutReferences
 /**
 * A favorite without references
 */
-export interface SCFavoriteWithoutReferences extends SCSaveableThingWithoutReferences {
-
+export interface SCFavoriteWithoutReferences
+  extends SCSaveableThingWithoutReferences {
+  // noop
 }

 /**
@@ -49,7 +50,8 @@ export interface SCFavoriteWithoutReferences extends SCSaveableThingWithoutRefer
 *
 * @validatable
 */
-export interface SCFavorite extends SCSaveableThing<SCFavoriteDataTypes> {
+export interface SCFavorite
+  extends SCSaveableThing<SCFavoriteDataTypes>, SCFavoriteWithoutReferences {
  /**
   * Type of a favorite
   */
@@ -59,5 +61,6 @@ export interface SCFavorite extends SCSaveableThing<SCFavoriteDataTypes> {
 /**
 * Meta information about a favorite
 */
-export class SCFavoriteMeta extends SCThingMeta {
+export class SCFavoriteMeta
+  extends SCThingMeta {
 }
--- a/src/core/things/Floor.ts
+++ b/src/core/things/Floor.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -14,7 +14,7 @@
 */
 import {Feature, FeatureCollection, GeometryObject, LineString} from 'geojson';
 import {SCThingInPlace, SCThingInPlaceMeta} from '../base/ThingInPlace';
-import {SCThing, SCThingMeta, SCThingTranslatableProperties, SCThingType} from '../Thing';
+import {SCThingMeta, SCThingTranslatableProperties, SCThingType, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCPointOfInterestWithoutReferences} from './PointOfInterest';
 import {SCRoomWithoutReferences} from './Room';
@@ -22,7 +22,8 @@ import {SCRoomWithoutReferences} from './Room';
 /**
 * A floor without references
 */
-export interface SCFloorWithoutReferences extends SCThing {
+export interface SCFloorWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Floor name in the place it is in e.g. "first floor", "ground floor". This doesn't reference the building name.
   */
@@ -49,7 +50,8 @@ export interface SCFloorWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCFloor extends SCFloorWithoutReferences, SCThingInPlace {
+export interface SCFloor
+  extends SCFloorWithoutReferences, SCThingInPlace {
  /**
   * Translated fields of a floor
   */
@@ -86,7 +88,8 @@ export interface SCFloorFeatureWithPlace<T extends GeometryObject, P = any>
 /**
 * Translatable properties of a floor
 */
-export interface SCFloorTranslatableProperties extends SCThingTranslatableProperties {
+export interface SCFloorTranslatableProperties
+  extends SCThingTranslatableProperties {
  /**
   * Translation of the floor name
   */
@@ -96,29 +99,31 @@ export interface SCFloorTranslatableProperties extends SCThingTranslatableProper
 /**
 * Meta information about floors
 */
-export class SCFloorMeta extends SCThingMeta implements SCMetaTranslations<SCFloor> {
+export class SCFloorMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCFloor> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
      type: 'Etage',
    },
    en: {
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Floor,
    },
  };
--- a/src/core/things/Message.ts
+++ b/src/core/things/Message.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -26,7 +26,8 @@ import {SCISO8601Date} from '../types/Time';
 /**
 * A message without references
 */
-export interface SCMessageWithoutReferences extends SCCreativeWorkWithoutReferences {
+export interface SCMessageWithoutReferences
+  extends SCCreativeWorkWithoutReferences {
  /**
   * Audience of the message
   */
@@ -58,7 +59,8 @@ export interface SCMessageWithoutReferences extends SCCreativeWorkWithoutReferen
 *
 * @validatable
 */
-export interface SCMessage extends SCCreativeWork, SCMessageWithoutReferences {
+export interface SCMessage
+  extends SCCreativeWork, SCMessageWithoutReferences {
  /**
   * Translated fields of a message
   */
@@ -92,29 +94,31 @@ export interface SCMessageTranslatableProperties
 /**
 * Meta information about messages
 */
-export class SCMessageMeta extends SCThingMeta implements SCMetaTranslations<SCMessage> {
+export class SCMessageMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCMessage> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
      type: 'Nachricht',
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Message,
    },
  };
--- a/src/core/things/Organization.ts
+++ b/src/core/things/Organization.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -13,12 +13,13 @@
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
 import {SCThingInPlace} from '../base/ThingInPlace';
-import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCThingMeta, SCThingType, SCThingWithoutReferences} from '../Thing';

 /**
 * An organization without references
 */
-export interface SCOrganizationWithoutReferences extends SCThing {
+export interface SCOrganizationWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Type of an organization
   */
@@ -30,7 +31,8 @@ export interface SCOrganizationWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCOrganization extends SCOrganizationWithoutReferences, SCThingInPlace {
+export interface SCOrganization
+  extends SCOrganizationWithoutReferences, SCThingInPlace {
  /**
   * Type of an organization
   */
--- a/src/core/things/Person.ts
+++ b/src/core/things/Person.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,7 +12,7 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCThing, SCThingMeta, SCThingType, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations, SCNationality} from '../types/i18n';
 import {SCISO8601Date} from '../types/Time';
 import {SCBuildingWithoutReferences} from './Building';
@@ -23,7 +23,8 @@ import {SCRoomWithoutReferences} from './Room';
 /**
 * A person without references
 */
-export interface SCPersonWithoutReferences extends SCThing {
+export interface SCPersonWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Additional first names of the person.
   */
@@ -102,7 +103,8 @@ export interface SCPersonWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCPerson extends SCPersonWithoutReferences {
+export interface SCPerson
+  extends SCPersonWithoutReferences, SCThing {
  /**
   * Organization the person works for
   */
@@ -129,29 +131,31 @@ export interface SCPerson extends SCPersonWithoutReferences {
 /**
 * Meta information about a person
 */
-export class SCPersonMeta extends SCThingMeta implements SCMetaTranslations<SCPerson> {
+export class SCPersonMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCPerson> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
      type: 'Person',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Person,
    },
  };
--- a/src/core/things/PointOfInterest.ts
+++ b/src/core/things/PointOfInterest.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,9 +12,10 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCPlaceWithoutReferences, SCPlaceWithoutReferencesMeta} from '../base/Place';
+import {SCPlace, SCPlaceWithoutReferences, SCPlaceWithoutReferencesMeta} from '../base/Place';
 import {SCThingInPlace} from '../base/ThingInPlace';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -27,8 +28,7 @@ import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 * A point of interest without references
 */
 export interface SCPointOfInterestWithoutReferences
-  extends SCThingWithCategoriesWithoutReferences<SCPointOfInterestCategories,
-    SCThingWithCategoriesSpecificValues>,
+  extends SCThingWithCategoriesWithoutReferences<SCPointOfInterestCategories, SCThingWithCategoriesSpecificValues>,
    SCPlaceWithoutReferences {
  /**
   * Translated properties of a point of interest
@@ -46,7 +46,9 @@ export interface SCPointOfInterestWithoutReferences
 *
 * @validatable
 */
-export interface SCPointOfInterest extends SCPointOfInterestWithoutReferences, SCThingInPlace {
+export interface SCPointOfInterest
+  extends SCPointOfInterestWithoutReferences, SCThingInPlace, SCPlace,
+    SCThingWithCategories<SCPointOfInterestCategories, SCThingWithCategoriesSpecificValues> {
  /**
   * Translated properties of a point of interest
   */
@@ -71,39 +73,41 @@ export type SCPointOfInterestCategories =
 /**
 * Meta information about points of interest
 */
-export class SCPointOfInterestMeta extends SCThingMeta implements SCMetaTranslations<SCPointOfInterest> {
+export class SCPointOfInterestMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCPointOfInterest> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
    },
    en: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
      type: 'Sonderziel',
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCPointOfInterestCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.PointOfInterest,
    },
  };
--- a/src/core/things/Room.ts
+++ b/src/core/things/Room.ts
@@ -12,13 +12,15 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCPlaceWithoutReferences, SCPlaceWithoutReferencesMeta} from '../base/Place';
+import {SCPlace, SCPlaceWithoutReferences, SCPlaceWithoutReferencesMeta} from '../base/Place';
 import {SCThingInPlace, SCThingInPlaceMeta} from '../base/ThingInPlace';
 import {
+  SCThingThatAcceptsPayments,
  SCThingThatAcceptsPaymentsWithoutReferences,
  SCThingThatAcceptsPaymentsWithoutReferencesMeta,
 } from '../base/ThingThatAcceptsPayments';
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
@@ -81,7 +83,9 @@ export interface SCRoomWithoutReferences
 *
 * @validatable
 */
-export interface SCRoom extends SCRoomWithoutReferences, SCThingInPlace {
+export interface SCRoom
+  extends SCRoomWithoutReferences, SCThingInPlace, SCThingThatAcceptsPayments, SCPlace,
+    SCThingWithCategories<SCRoomCategories, SCRoomSpecificValues> {
  /**
   * Translations of specific values of the object
   *
@@ -98,7 +102,8 @@ export interface SCRoom extends SCRoomWithoutReferences, SCThingInPlace {
 /**
 * Category specific values of a room
 */
-export interface SCRoomSpecificValues extends SCThingWithCategoriesSpecificValues {
+export interface SCRoomSpecificValues
+  extends SCThingWithCategoriesSpecificValues {
  /**
   * Category specific opening hours of the room
   */
@@ -108,37 +113,39 @@ export interface SCRoomSpecificValues extends SCThingWithCategoriesSpecificValue
 /**
 * Meta information about a place
 */
-export class SCRoomMeta extends SCThingMeta implements SCMetaTranslations<SCRoom> {
+export class SCRoomMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCRoom> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
-      ... SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
-            SCRoomSpecificValues>().fieldTranslations.de,
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.de,
+      ...SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
+        SCRoomSpecificValues>().fieldTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
-      ... SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
-            SCRoomSpecificValues>().fieldTranslations.en,
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldTranslations.en,
+      ...SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
+        SCRoomSpecificValues>().fieldTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
-      ... SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
-                SCRoomSpecificValues>().fieldValueTranslations.de,
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
+        SCRoomSpecificValues>().fieldValueTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
      categories: {
        'cafe': 'Café',
        'canteen': 'Kantine',
@@ -157,11 +164,11 @@ export class SCRoomMeta extends SCThingMeta implements SCMetaTranslations<SCRoom
      type: 'Raum',
    },
    en: {
-      ... SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
-      ... SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
-                SCRoomSpecificValues>().fieldValueTranslations.en,
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
+      ...SCPlaceWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingThatAcceptsPaymentsWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCRoomCategories,
+        SCRoomSpecificValues>().fieldValueTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Room,
    },
  };
--- a/src/core/things/Semester.ts
+++ b/src/core/things/Semester.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,14 +12,19 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCAcademicTermWithoutReferences, SCAcademicTermWithoutReferencesMeta} from '../base/AcademicTerm';
+import {
+  SCAcademicTerm,
+  SCAcademicTermWithoutReferences,
+  SCAcademicTermWithoutReferencesMeta,
+} from '../base/AcademicTerm';
 import {SCThingMeta, SCThingType} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';

 /**
 * A semester without references
 */
-export interface SCSemesterWithoutReferences extends SCAcademicTermWithoutReferences {
+export interface SCSemesterWithoutReferences
+  extends SCAcademicTermWithoutReferences {
  /**
   * The short name of the semester, using the given pattern.
   *
@@ -38,7 +43,8 @@ export interface SCSemesterWithoutReferences extends SCAcademicTermWithoutRefere
 *
 * @validatable
 */
-export interface SCSemester extends SCSemesterWithoutReferences {
+export interface SCSemester
+  extends SCSemesterWithoutReferences, SCAcademicTerm {
  /**
   * Type of the semester
   */
@@ -48,13 +54,15 @@ export interface SCSemester extends SCSemesterWithoutReferences {
 /**
 * Meta information about a semester
 */
-export class SCSemesterMeta extends SCThingMeta implements SCMetaTranslations<SCSemester> {
+export class SCSemesterMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCSemester> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCAcademicTermWithoutReferencesMeta.getInstance().fieldTranslations.de,
+      ...SCAcademicTermWithoutReferencesMeta.getInstance().fieldTranslations.de,
      acronym: 'Abkürzung',
      endDate: 'Ende',
      eventsEndDate: 'Vorlesungsschluss',
@@ -62,20 +70,20 @@ export class SCSemesterMeta extends SCThingMeta implements SCMetaTranslations<SC
      startDate: 'Beginn',
    },
    en: {
-      ... SCAcademicTermWithoutReferencesMeta.getInstance().fieldTranslations.en,
+      ...SCAcademicTermWithoutReferencesMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCAcademicTermWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
+      ...SCAcademicTermWithoutReferencesMeta.getInstance().fieldValueTranslations.de,
      type: 'Semester',
    },
    en: {
-      ... SCAcademicTermWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
+      ...SCAcademicTermWithoutReferencesMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Semester,
    },
  };
--- a/src/core/things/Setting.ts
+++ b/src/core/things/Setting.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -13,12 +13,13 @@
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
  SCThingWithCategoriesWithoutReferencesMeta,
 } from '../base/ThingWithCategories';
-import {SCThingMeta, SCThingType} from '../Thing';
+import {SCThing, SCThingMeta, SCThingType} from '../Thing';
 import {SCMetaTranslations, SCTranslations} from '../types/i18n';

 export type SCSettingCategories = string;
@@ -74,7 +75,13 @@ export enum SCSettingInputType {
 *
 * @validatable
 */
-export interface SCSetting extends SCSettingWithoutReferences {
+export interface SCSetting
+  extends SCSettingWithoutReferences, SCThing,
+    SCThingWithCategories<SCSettingCategories, SCThingWithCategoriesSpecificValues> {
+  /**
+   * Translated fields of a setting
+   */
+  translations?: SCTranslations<SCSettingValueTranslatableProperties>;
  /**
   * The type of this model
   */
@@ -111,8 +118,8 @@ export class SCSettingMeta extends SCThingMeta implements SCMetaTranslations<SCS
  fieldTranslations = {
    de: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
-                SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
      defaultValue: 'Standard Wert',
      inputType: 'Eingabetyp',
      value: 'Wert',
@@ -120,8 +127,8 @@ export class SCSettingMeta extends SCThingMeta implements SCMetaTranslations<SCS
    },
    en: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
-                SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
      defaultValue: 'default value',
      inputType: 'input type',
    },
@@ -130,24 +137,24 @@ export class SCSettingMeta extends SCThingMeta implements SCMetaTranslations<SCS
  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
-                SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
      inputType: {
        'multiple choice': 'mehrfach Auswahl',
        number: 'Zahl',
        password: 'Passwort',
        'single choice': 'einfache Auswahl',
        text: 'Text',
-       },
+      },
      type: 'Einstellung',
    },
    en: {
      // tslint:disable-next-line:max-line-length
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
-                SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<SCSettingCategories,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
      type: SCThingType.Setting,
    },
  };
--- a/src/core/things/SportCourse.ts
+++ b/src/core/things/SportCourse.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -19,7 +19,8 @@ import {SCMetaTranslations} from '../types/i18n';
 /**
 * A sport course without references
 */
-export interface SCSportCourseWithoutReferences extends SCEventWithoutReferences {
+export interface SCSportCourseWithoutReferences
+  extends SCEventWithoutReferences {
  /**
   * Type of a sport course
   */
@@ -31,7 +32,8 @@ export interface SCSportCourseWithoutReferences extends SCEventWithoutReferences
 *
 * @validatable
 */
-export interface SCSportCourse extends SCEvent, SCSportCourseWithoutReferences {
+export interface SCSportCourse
+  extends SCEvent, SCSportCourseWithoutReferences {
  /**
   * Type of a sport course
   */
@@ -41,33 +43,35 @@ export interface SCSportCourse extends SCEvent, SCSportCourseWithoutReferences {
 /**
 * Meta information about a sport course
 */
-export class SCSportCourseMeta extends SCThingMeta implements SCMetaTranslations<SCSportCourse> {
+export class SCSportCourseMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCSportCourse> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
-      ... SCEventMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCEventMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
-      ... SCEventMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCEventMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
-      ... SCEventMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCEventMeta.getInstance().fieldValueTranslations.de,
      type: 'Sportkurs',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
-      ... SCEventMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCEventMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.SportCourse,
    },
  };
--- a/src/core/things/StudyModule.ts
+++ b/src/core/things/StudyModule.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018-2019 StApps
+ * Copyright (C) 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,9 +12,12 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCAcademicPriceGroup,
-        SCThingThatCanBeOffered,
-        SCThingThatCanBeOfferedTranslatableProperties} from '../base/ThingThatCanBeOffered';
+import {
+  SCAcademicPriceGroup,
+  SCThingThatCanBeOffered,
+  SCThingThatCanBeOfferedTranslatableProperties,
+  SCThingThatCanBeOfferedWithoutReferences,
+} from '../base/ThingThatCanBeOffered';
 import {SCThingMeta, SCThingType} from '../Thing';
 import {SCLanguage, SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCMap} from '../types/Map';
@@ -25,8 +28,8 @@ import {SCPersonWithoutReferences} from './Person';
 /**
 * A study module without references
 */
-export interface SCStudyModuleWithoutReferences extends
-                 SCThingThatCanBeOffered<SCAcademicPriceGroup> {
+export interface SCStudyModuleWithoutReferences
+  extends SCThingThatCanBeOfferedWithoutReferences {

  /**
   * ECTS points (European Credit Transfer System)
@@ -61,10 +64,11 @@ export interface SCStudyModuleWithoutReferences extends

 /**
 * A study module
- * 
+ *
 * @validatable
 */
-export interface SCStudyModule extends SCStudyModuleWithoutReferences {
+export interface SCStudyModule
+  extends SCStudyModuleWithoutReferences, SCThingThatCanBeOffered<SCAcademicPriceGroup> {
  /**
   * Academic events that make up a study module
   */
@@ -86,14 +90,24 @@ export interface SCStudyModule extends SCStudyModuleWithoutReferences {
  requiredModules?: SCStudyModuleWithoutReferences[];

  /**
-   * The secretary that administers requests and 
+   * The secretary that administers requests and
   * questions concerning the study module by eg. students
   */
  secretary: SCOrganizationWithoutReferences | SCPersonWithoutReferences;
+
+  /**
+   * Translated fields of a study module
+   */
+  translations?: SCTranslations<SCStudyModuleTranslatableProperties>;
+
+  /**
+   * Type of the study module
+   */
+  type: SCThingType.StudyModule;
 }

 export interface SCStudyModuleTranslatableProperties
-       extends SCThingThatCanBeOfferedTranslatableProperties {
+  extends SCThingThatCanBeOfferedTranslatableProperties {
  /**
   * Translations of the majors that this study module is meant for
   */
@@ -105,8 +119,8 @@ export interface SCStudyModuleTranslatableProperties
  necessity: SCMap<SCStudyModuleNecessity>;
 }

-/** 
- * Represents a modules necessity (in a major) as it may be required, optional or 
+/**
+ * Represents a modules necessity (in a major) as it may be required, optional or
 * is in a pool of n optional modules were m out of them have to be taken/completed.
 * Hence the elective option.
 */
@@ -119,13 +133,15 @@ export enum SCStudyModuleNecessity {
 /**
 * Study module meta data
 */
-export class SCStudyModuleMeta extends SCThingMeta implements SCMetaTranslations<SCStudyModule> {
+export class SCStudyModuleMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCStudyModule> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldTranslations.de,
+      ...SCThingMeta.getInstance().fieldTranslations.de,
      academicEvents: 'Veranstaltungen',
      ects: 'ECTS-Punkte',
      faculty: 'Fachbereich',
@@ -137,7 +153,7 @@ export class SCStudyModuleMeta extends SCThingMeta implements SCMetaTranslations
      secretary: 'Sekretariat',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldTranslations.en,
+      ...SCThingMeta.getInstance().fieldTranslations.en,
      academicEvents: 'academic events',
      ects: 'ECTS points',
      faculty: 'faculty',
@@ -153,18 +169,18 @@ export class SCStudyModuleMeta extends SCThingMeta implements SCMetaTranslations
  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingMeta.getInstance().fieldValueTranslations.de,
      necessity: {
-        'elective' : 'Wahlfach',
-        'optional' : 'optional',
-        'required' : 'benötigt',
+        'elective': 'Wahlfach',
+        'optional': 'optional',
+        'required': 'benötigt',
      },
      type: 'Studiengangmodul',
    },
    en: {
-      ... SCThingMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.StudyModule,
    },
  };
--- a/src/core/things/Ticket.ts
+++ b/src/core/things/Ticket.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -13,14 +13,15 @@
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
 import {SCThingInPlace, SCThingInPlaceMeta} from '../base/ThingInPlace';
-import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCThingMeta, SCThingType, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';
 import {SCISO8601Duration} from '../types/Time';

 /**
 * A ticket without references
 */
-export interface SCTicketWithoutReferences extends SCThing {
+export interface SCTicketWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Approximate wait time
   */
@@ -47,7 +48,8 @@ export interface SCTicketWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCTicket extends SCTicketWithoutReferences, SCThingInPlace {
+export interface SCTicket
+  extends SCTicketWithoutReferences, SCThingInPlace {
  /**
   * Type of a ticket
   */
@@ -57,29 +59,31 @@ export interface SCTicket extends SCTicketWithoutReferences, SCThingInPlace {
 /**
 * Meta information about a ticket
 */
-export class SCTicketMeta extends SCThingMeta implements SCMetaTranslations<SCTicket> {
+export class SCTicketMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCTicket> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCThingInPlaceMeta.getInstance().fieldTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
      type: 'Ticket',
    },
    en: {
-      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
+      ...SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Ticket,
    },
  };
--- a/src/core/things/ToDo.ts
+++ b/src/core/things/ToDo.ts
@@ -13,11 +13,14 @@
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
 import {
+  SCThingWithCategories,
  SCThingWithCategoriesSpecificValues,
+  SCThingWithCategoriesTranslatableProperties,
  SCThingWithCategoriesWithoutReferences,
-  SCThingWithCategoriesWithoutReferencesMeta} from '../base/ThingWithCategories';
-import {SCThingMeta, SCThingType} from '../Thing';
-import {SCMetaTranslations} from '../types/i18n';
+  SCThingWithCategoriesWithoutReferencesMeta,
+} from '../base/ThingWithCategories';
+import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCISO8601Date} from '../types/Time';

 /**
@@ -51,7 +54,17 @@ export interface SCToDoWithoutReferences
 *
 * @validatable
 */
-export interface SCToDo extends SCToDoWithoutReferences {
+export interface SCToDo
+  extends SCToDoWithoutReferences, SCThing, SCThingWithCategories<string, SCThingWithCategoriesSpecificValues> {
+  /**
+   * Translated fields of a thing with categories
+   */
+  translations?: SCTranslations<SCThingWithCategoriesTranslatableProperties>;
+
+  /**
+   * Type of the "to do"
+   */
+  type: SCThingType.ToDo;
 }

 /**
@@ -72,27 +85,27 @@ export class SCToDoMeta extends SCThingMeta implements SCMetaTranslations<SCToDo
   */
  fieldTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.de,
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
-            SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
+        SCThingWithCategoriesSpecificValues>().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.de,
      type: 'ToDo',
    },
    en: {
-      ... SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
-            SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
+      ...SCThingWithCategoriesWithoutReferencesMeta.getInstance<string,
+        SCThingWithCategoriesSpecificValues>().fieldValueTranslations.en,
      type: SCThingType.ToDo,
    },
  };
--- a/src/core/things/Tour.ts
+++ b/src/core/things/Tour.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,13 +12,14 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThing, SCThingMeta, SCThingType} from '../Thing';
+import {SCThing, SCThingMeta, SCThingType, SCThingWithoutReferences} from '../Thing';
 import {SCMetaTranslations} from '../types/i18n';

 /**
 * A tour without references
 */
-export interface SCTourWithoutReferences extends SCThing {
+export interface SCTourWithoutReferences
+  extends SCThingWithoutReferences {
  /**
   * Init script for the tour
   */
@@ -40,7 +41,8 @@ export interface SCTourWithoutReferences extends SCThing {
 *
 * @validatable
 */
-export interface SCTour extends SCTourWithoutReferences {
+export interface SCTour
+  extends SCTourWithoutReferences, SCThing {
  /**
   * Type of a tour
   */
@@ -50,7 +52,9 @@ export interface SCTour extends SCTourWithoutReferences {
 /**
 * Meta information about a tour
 */
-export class SCTourMeta extends SCThingMeta implements SCMetaTranslations<SCTour> {
+export class SCTourMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCTour> {
 }

 /**
--- a/src/core/things/Video.ts
+++ b/src/core/things/Video.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -21,7 +21,8 @@ import {SCPersonWithoutReferences} from './Person';
 /**
 * A video without references
 */
-export interface SCVideoWithoutReferences extends SCCreativeWorkWithoutReferences {
+export interface SCVideoWithoutReferences
+  extends SCCreativeWorkWithoutReferences {
  /**
   * The Duration of the Video
   */
@@ -102,7 +103,8 @@ export interface SCVideoTrack {
 *
 * @validatable
 */
-export interface SCVideo extends SCCreativeWork, SCVideoWithoutReferences {
+export interface SCVideo
+  extends SCCreativeWork, SCVideoWithoutReferences {
  /**
   * Persons acting in the Video
   */
@@ -117,29 +119,31 @@ export interface SCVideo extends SCCreativeWork, SCVideoWithoutReferences {
 /**
 * Meta information about a video
 */
-export class SCVideoMeta extends SCThingMeta implements SCMetaTranslations<SCVideo> {
+export class SCVideoMeta
+  extends SCThingMeta
+  implements SCMetaTranslations<SCVideo> {
  /**
   * Translations of fields
   */
  fieldTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.de,
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldTranslations.en,
    },
  };

  /**
   * Translations of values of fields
   */
-  fieldValueTranslations  = {
+  fieldValueTranslations = {
    de: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.de,
      type: 'Video',
    },
    en: {
-      ... SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
+      ...SCCreativeWorkMeta.getInstance().fieldValueTranslations.en,
      type: SCThingType.Video,
    },
  };
--- a/src/core/types/GeoInformation.ts
+++ b/src/core/types/GeoInformation.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018-2019 StApps
+ * Copyright (C) 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/types/Guards.ts
+++ b/src/core/types/Guards.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
@@ -12,16 +12,16 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
-import {SCThingWithTranslations} from '../base/ThingWithTranslations';
 import {SCBulkResponse} from '../protocol/routes/bulk/BulkResponse';
 import {SCMultiSearchResponse} from '../protocol/routes/search/MultiSearchResponse';
 import {SCSearchResponse} from '../protocol/routes/search/SearchResponse';
-import {SCThing, SCThingType} from '../Thing';
+import {SCThing, SCThingTranslatableProperties, SCThingType, SCThingWithoutReferences} from '../Thing';
+import {SCTranslations} from './i18n';

 /**
 * Type guard to check if something is a SCThing
 *
- * @param {any} something Something to check
+ * @param something Something to check
 */
 export function isThing(something: any): something is SCThing {
  return (
@@ -34,16 +34,17 @@ export function isThing(something: any): something is SCThing {
 /**
 * Type guard to check if translations exist
 *
- * @param {SCThing} thing Thing to check
+ * @param thing Thing to check
 */
-export function isThingWithTranslations(thing: SCThing): thing is SCThingWithTranslations {
+export function isThingWithTranslations(thing: SCThingWithoutReferences)
+  : thing is SCThingWithoutReferences & { translations: SCTranslations<SCThingTranslatableProperties> } {
  return typeof thing.translations !== 'undefined';
 }

 /**
 * Type guard to check if something is a bulk response
 *
- * @param {any} something Something to check
+ * @param something Something to check
 */
 export function isBulkResponse(something: any): something is SCBulkResponse {
  return typeof something.expiration === 'string'
@@ -56,7 +57,7 @@ export function isBulkResponse(something: any): something is SCBulkResponse {
 /**
 * Type guard to check if something is a search response
 *
- * @param {any} something Something to check
+ * @param something Something to check
 */
 export function isSearchResponse(something: any): something is SCSearchResponse {
  return Array.isArray(something.data)
--- a/src/core/types/Map.ts
+++ b/src/core/types/Map.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018-2019 StApps
+ * Copyright (C) 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/types/config/App.ts
+++ b/src/core/types/config/App.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/src/core/types/i18n.ts
+++ b/src/core/types/i18n.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 StApps
+ * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
--- a/test/Schema.spec.ts
+++ b/test/Schema.spec.ts
@@ -12,24 +12,259 @@
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
+import {getProjectReflection} from '@openstapps/core-tools/lib/common';
 import {validateFiles, writeReport} from '@openstapps/core-tools/lib/validate';
 import {Logger} from '@openstapps/logger';
+import {fail} from 'assert';
 import {expect} from 'chai';
 import {mkdirSync} from 'fs';
 import {slow, suite, test, timeout} from 'mocha-typescript';
 import {join, resolve} from 'path';
-
-const logger = new Logger();
+import {DeclarationReflection, ProjectReflection} from 'typedoc';
+import {ArrayType, IntrinsicType, ReferenceType, StringLiteralType, Type, UnionType} from 'typedoc/dist/lib/models';

 process.on('unhandledRejection', (err) => {
-  logger.error('UNHANDLED REJECTION', err.stack);
+  Logger.error('UNHANDLED REJECTION', err.stack);
  process.exit(1);
 });

+/**
+ * Check if type is a union type
+ *
+ * @param type Type to check
+ */
+function isUnionType(type: Type): type is UnionType {
+  return type.type === 'union';
+}
+
+/**
+ * Check if a type is reference type
+ *
+ * @param type Type to check
+ */
+function isReferenceType(type: Type): type is ReferenceType {
+  return type.type === 'reference';
+}
+
+/**
+ * Check if a type is an array type
+ *
+ * @param type Type to check
+ */
+function isArrayType(type: Type): type is ArrayType {
+  return type.type === 'array';
+}
+
+/**
+ * Check if a type is an intrinsic type
+ *
+ * @param type Type to check
+ */
+function isIntrinsicType(type: Type): type is IntrinsicType {
+  return type.type === 'intrinsic';
+}
+
+/**
+ * Check if a type is a string literal type
+ *
+ * @param type Type to check
+ */
+function isStringLiteralType(type: Type): type is StringLiteralType {
+  return type.type === 'stringLiteral';
+}
+
+/**
+ * Get extended types of a declaration reflection
+ * @param thingReflection Reflection of the thing
+ * @param objects Map of reflections by name
+ */
+function getExtendedTypes(thingReflection: DeclarationReflection,
+                          objects: { [name: string]: DeclarationReflection }): string[] {
+  const extendedTypes: string[] = [];
+
+  if (Array.isArray(thingReflection.extendedTypes)) {
+    const typesToCheck = thingReflection.extendedTypes.slice();
+
+    while (typesToCheck.length > 0) {
+      const extendedType = typesToCheck.splice(0, 1)[0];
+
+      extendedTypes.push((extendedType as unknown as ReferenceType).name);
+
+      const extendedObject = objects[(extendedType as unknown as ReferenceType).name];
+
+      if (typeof extendedObject !== 'undefined') {
+        if (Array.isArray(extendedObject.extendedTypes)) {
+          typesToCheck.push.apply(typesToCheck, extendedObject.extendedTypes);
+        }
+      }
+    }
+  }
+
+  return extendedTypes;
+}
+
@suite(timeout(10000), slow(5000))
-export class ValidateTestFiles {
+export class SchemaSpec {
+  static objects: { [name: string]: DeclarationReflection } = {};
+  static reflection: ProjectReflection;
+  static thingNames: string[];
+
+  static before() {
+    SchemaSpec.reflection = getProjectReflection(resolve(__dirname, '..', 'src'));
+
+    if (Array.isArray(SchemaSpec.reflection.children)) {
+      for (const module of SchemaSpec.reflection.children) {
+        if (Array.isArray(module.children)) {
+          for (const object of module.children) {
+            SchemaSpec.objects[object.name] = object;
+          }
+        }
+      }
+    }
+
+    const thingsReflection = SchemaSpec.objects.SCThingsWithoutDiff;
+
+    // tslint:disable-next-line:no-unused-expression
+    expect(thingsReflection).not.to.be.undefined;
+
+    // tslint:disable-next-line:no-unused-expression
+    expect(isUnionType(thingsReflection.type!)).to.be.true;
+
+    (thingsReflection.type! as UnionType).types.push({
+      'id': 0,
+      'name': 'SCDiff',
+      'type': 'reference',
+    } as unknown as ReferenceType);
+
+    // tslint:disable-next-line:no-unused-expression
+    expect((thingsReflection.type! as UnionType).types.every(isReferenceType)).to.be.true;
+
+    SchemaSpec.thingNames = (thingsReflection.type! as UnionType).types.map((type) => {
+      return (type as ReferenceType).name;
+    });
+  }
+
  @test
-  async validateTestFiles() {
+  'all things have an origin'() {
+    for (const thingName of SchemaSpec.thingNames) {
+      const thingReflection = SchemaSpec.objects[`${thingName}`];
+
+      let originFound = false;
+
+      if (Array.isArray(thingReflection.children)) {
+        for (const property of thingReflection.children) {
+          if (property.name === 'origin') {
+            originFound = true;
+            break;
+          }
+        }
+      }
+
+      // tslint:disable-next-line:no-unused-expression
+      expect(originFound).to.be.equal(true, `'${thingName}' must have property 'origin'.`);
+    }
+  }
+
+  @test
+  'does not have duplicate names'() {
+    const names: string[] = [];
+
+    if (Array.isArray(SchemaSpec.reflection.children)) {
+      for (const module of SchemaSpec.reflection.children) {
+        if (Array.isArray(module.children)) {
+          for (const object of module.children) {
+            expect(names).not.to.contain(object.name);
+            names.push(object.name);
+          }
+        }
+      }
+    }
+  }
+
+  @test
+  'no property is an SCThing'() {
+    for (const thingName of SchemaSpec.thingNames) {
+      const thingReflection = SchemaSpec.objects[`${thingName}`];
+
+      if (Array.isArray(thingReflection.children)) {
+        for (const property of thingReflection.children) {
+          if (typeof property.type === 'undefined') {
+            Logger.error(thingName, property.name);
+            continue;
+          }
+
+          const type = property.type!;
+
+          if (isIntrinsicType(type)) {
+            continue;
+          } else if (isArrayType(type)) {
+            const elementType = type.elementType;
+
+            if (isIntrinsicType(elementType)) {
+              continue;
+            } else if (isReferenceType(elementType)) {
+              expect(SchemaSpec.thingNames).not.to.contain(
+                elementType.name,
+                `Array property '${property.name}' on type '${thingName}' has element type '${elementType.name}'.`,
+              );
+            } else {
+              // tslint:disable-next-line:max-line-length
+              fail(`'${thingName}'#'${property.name}' element type '${elementType.type}' is not handled by this test!`);
+            }
+          } else if (isReferenceType(type)) {
+            expect(SchemaSpec.thingNames).not.to.contain(
+              type.name,
+              `Property '${property.name}' on type '${thingName}' has element type '${type.name}'.`,
+            );
+          } else if (isUnionType(type)) {
+            for (const nestedType of type.types) {
+              if (isIntrinsicType(nestedType) || isStringLiteralType(nestedType)) {
+                continue;
+              } else if (isReferenceType(nestedType)) {
+                expect(SchemaSpec.thingNames).not.to.contain(
+                  nestedType.name,
+                  `Union property '${property.name}' on type '${thingName}' contains type '${nestedType.name}'.`,
+                );
+              } else {
+                // tslint:disable-next-line:max-line-length
+                fail(`'${thingName}'#'${property.name}' union type '${nestedType.type}' is not handled by this test!`);
+              }
+            }
+          } else {
+            // tslint:disable-next-line:max-line-length
+            fail(`'${thingName}'#'${property.name}' with type '${type.type}' is not handled by this test!`);
+          }
+        }
+      }
+    }
+  }
+
+  @test
+  'things extend SCThing'() {
+    for (const thingName of SchemaSpec.thingNames) {
+      const thingReflection = SchemaSpec.objects[`${thingName}`];
+
+      expect(getExtendedTypes(thingReflection, SchemaSpec.objects)).to.contain(
+        'SCThing',
+        `'${thingName}' neither extends 'SCThing' transitively nor directly.`,
+      );
+    }
+  }
+
+  @test
+  'things without references do not extend SCThing'() {
+    for (const thingName of SchemaSpec.thingNames) {
+      const thingWithoutReferencesReflection = SchemaSpec.objects[`${thingName}WithoutReferences`];
+
+      expect(getExtendedTypes(thingWithoutReferencesReflection, SchemaSpec.objects)).not.to.contain(
+        'SCThing',
+        `'${thingName}WithoutReferences' extends 'SCThing' either transitively or directly.`,
+      );
+    }
+  }
+
+  @test
+  async 'validate against test files'() {
    const errorsPerFile = await validateFiles(resolve('lib', 'schema'), resolve('test', 'resources'));

    let unexpected = false;
@@ -37,12 +272,12 @@ export class ValidateTestFiles {
      unexpected = unexpected || errorsPerFile[file].some((error) => !error.expected);
    });

-    expect(unexpected).to.be.equal(false);
-
    mkdirSync('report', {
      recursive: true,
    });

    await writeReport(join('report', 'index.html'), errorsPerFile);
+
+    expect(unexpected).to.be.equal(false);
  }
 }
--- a/test/Translator.spec.ts
+++ b/test/Translator.spec.ts
@@ -37,11 +37,6 @@ const building: SCBuildingWithoutReferences = {
    },
  },
  name: 'base-space-name',
-  origin: {
-    indexed: '1970-01-01T00:00:00.000Z',
-    name: 'building-connector',
-    type: SCThingOriginType.Remote,
-  },
  translations: {
    de: {
      address: {
@@ -72,11 +67,6 @@ const dish: SCDish = {
    },
    provider: {
      name: 'base-provider',
-      origin: {
-        indexed: '1970-01-01T00:00:00.000Z',
-        name: 'dish-connector',
-        type: SCThingOriginType.Remote,
-        },
      type: SCThingType.Organization,
      uid: '540862f3-ea30-5b8f-8678-56b4dc217141',
      },
--- a/test/resources/AcademicEvent.1.json
+++ b/test/resources/AcademicEvent.1.json
@@ -20,12 +20,7 @@
        "startDate": "2018-04-01",
        "endDate": "2018-09-30",
        "eventsStartDate": "2018-04-09",
-        "eventsEndDate": "2018-07-13",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "eventsEndDate": "2018-07-13"
      }
    ],
    "performers": [
@@ -36,12 +31,7 @@
        "familyName": "Bürgisser",
        "gender": "male",
        "honorificPrefix": "Prof. Dr.",
-        "name": "Peter Bürgisser",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Peter Bürgisser"
      }
    ],
    "majors": [
@@ -59,12 +49,7 @@
      "maintainer": {
        "type": "organization",
        "name": "tubIT",
-        "uid": "25f76840-db89-5da2-a8a2-75992f637613",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "uid": "25f76840-db89-5da2-a8a2-75992f637613"
      },
      "modified": "2018-09-01T10:00:00Z",
      "originalId": "foo bar",
@@ -75,12 +60,7 @@
        "familyName": "Bürgisser",
        "gender": "male",
        "honorificPrefix": "Prof. Dr.",
-        "name": "Peter Bürgisser",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Peter Bürgisser"
      }
    }
  },
--- a/test/resources/AcademicEvent.2.json
+++ b/test/resources/AcademicEvent.2.json
@@ -20,12 +20,7 @@
        "startDate": "2018-04-01",
        "endDate": "2018-09-30",
        "eventsStartDate": "2018-04-09",
-        "eventsEndDate": "2018-07-13",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "eventsEndDate": "2018-07-13"
      }
    ],
    "performers": [
@@ -36,12 +31,7 @@
        "familyName": "Liesen",
        "gender": "male",
        "honorificPrefix": "Prof. Dr.",
-        "name": "Jörg Liesen",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Jörg Liesen"
      }
    ],
    "catalogs": [
@@ -53,12 +43,7 @@
        "categories": [
          "university events"
        ],
-        "name": "Mathematik: Lehrveranstaltungen für andere Fachrichtungen (Service)",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Mathematik: Lehrveranstaltungen für andere Fachrichtungen (Service)"
      }
    ],
    "majors": [
--- a/test/resources/AcademicEvent.3.json
+++ b/test/resources/AcademicEvent.3.json
@@ -20,12 +20,7 @@
        "startDate": "2018-04-01",
        "endDate": "2018-09-30",
        "eventsStartDate": "2018-04-09",
-        "eventsEndDate": "2018-07-13",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "eventsEndDate": "2018-07-13"
      }
    ],
    "performers": [
@@ -35,12 +30,7 @@
        "givenName": "Paul",
        "familyName": "Breiding",
        "gender": "male",
-        "name": "Paul Breiding",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Paul Breiding"
      },
      {
        "type": "person",
@@ -48,12 +38,7 @@
        "givenName": "Pierre",
        "familyName": "Lairez",
        "gender": "male",
-        "name": "Pierre Lairez",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Pierre Lairez"
      }
    ],
    "catalogs": [
@@ -64,12 +49,7 @@
        "categories": [
          "university events"
        ],
-        "name": "Mathematik: Grundstudiums-Veranstaltungen (Diplom, Bachelor)",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Mathematik: Grundstudiums-Veranstaltungen (Diplom, Bachelor)"
      },
      {
        "uid": "5a1f4f51-2498-5af1-91cb-c939673cc69c",
@@ -79,12 +59,7 @@
        "categories": [
          "university events"
        ],
-        "name": "Mathematik: Lehrveranstaltungen für andere Fachrichtungen (Service)",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Mathematik: Lehrveranstaltungen für andere Fachrichtungen (Service)"
      }
    ],
    "majors": [
--- a/test/resources/Book.1.json
+++ b/test/resources/Book.1.json
@@ -10,12 +10,7 @@
        "uid": "10dfe386-71b4-554a-beb1-2d38561e42f8",
        "name": "Jutta Saatweber",
        "givenName": "Jutta",
-        "familyName": "Saatweber",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "familyName": "Saatweber"
      }
    ],
    "datePublished": "2007-08-01",
@@ -23,12 +18,7 @@
      {
        "type": "organization",
        "uid": "28df2bb9-c854-5898-b9d5-1abbd3524804",
-        "name": "Symposion Publishing",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Symposion Publishing"
      }
    ],
    "inLanguages": [
--- a/test/resources/Book.2.json
+++ b/test/resources/Book.2.json
@@ -10,12 +10,7 @@
        "uid": "10dfe386-71b4-554a-beb1-2d38561e42f8",
        "name": "Jutta Saatweber",
        "givenName": "Jutta",
-        "familyName": "Saatweber",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "familyName": "Saatweber"
      }
    ],
    "datePublished": "2007-08-01",
--- a/test/resources/Catalog.1.json
+++ b/test/resources/Catalog.1.json
@@ -17,12 +17,7 @@
        "WiSe 2017/18"
      ],
      "startDate": "2017-10-01",
-      "endDate": "2018-03-31",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "endDate": "2018-03-31"
    },
    "superCatalog": {
      "type": "catalog",
@@ -31,12 +26,7 @@
        "university events"
      ],
      "uid": "a7404d36-282d-546e-bfa5-6c7b25ba7838",
-      "name": "Vorlesungsverzeichnis WS 2017/18",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "name": "Vorlesungsverzeichnis WS 2017/18"
    },
    "superCatalogs": [
      {
@@ -46,12 +36,7 @@
          "university events"
        ],
        "uid": "a7404d36-282d-546e-bfa5-6c7b25ba7838",
-        "name": "Vorlesungsverzeichnis WS 2017/18",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Vorlesungsverzeichnis WS 2017/18"
      }
    ],
    "origin": {
--- a/test/resources/Catalog.2.json
+++ b/test/resources/Catalog.2.json
@@ -18,12 +18,7 @@
        "WiSe 2017/18"
      ],
      "startDate": "2017-10-01",
-      "endDate": "2018-03-31",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "endDate": "2018-03-31"
    },
    "superCatalog": {
      "uid": "2fdcccce-1948-5f5a-8938-3711b7e65e8a",
@@ -32,12 +27,7 @@
      "categories": [
        "university events"
      ],
-      "name": "Mathematik",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "name": "Mathematik"
    },
    "superCatalogs": [
      {
@@ -47,12 +37,7 @@
          "university events"
        ],
        "uid": "a7404d36-282d-546e-bfa5-6c7b25ba7838",
-        "name": "Vorlesungsverzeichnis WS 2017",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Vorlesungsverzeichnis WS 2017"
      },
      {
        "uid": "0718211b-d0c2-50fb-bc78-b968f20fd95b",
@@ -61,12 +46,7 @@
        "categories": [
          "university events"
        ],
-        "name": "Fakultät II Mathematik und Naturwissenschaften",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Fakultät II Mathematik und Naturwissenschaften"
      },
      {
        "uid": "2fdcccce-1948-5f5a-8938-3711b7e65e8a",
@@ -75,12 +55,7 @@
        "categories": [
          "university events"
        ],
-        "name": "Mathematik",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "name": "Mathematik"
      }
    ],
    "origin": {
--- a/test/resources/CourseOfStudies.1.json
+++ b/test/resources/CourseOfStudies.1.json
@@ -6,11 +6,6 @@
    "academicDegreewithFieldShort": "B.A.",
    "department": {
      "name": "Technische Universität Berlin",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      },
      "type": "organization",
      "uid": "b0f878fd-8fda-53b8-b065-a8d854c3d0d2"
    },
@@ -28,11 +23,6 @@
    },
    "secretary": {
      "name": "Technische Universität Berlin",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      },
      "type": "organization",
      "uid": "b0f878fd-8fda-53b8-b065-a8d854c3d0d2"
    },
--- a/test/resources/DateSeries.1.json
+++ b/test/resources/DateSeries.1.json
@@ -20,11 +20,6 @@
            52.51211
          ]
        }
-      },
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
      }
    },
    "frequency": "once",
@@ -41,12 +36,7 @@
      "majors": [
        "Economics BSc",
        "Wirtschaftsingenieurwesen BSc"
-      ],
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      ]
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
--- a/test/resources/DateSeries.2.json
+++ b/test/resources/DateSeries.2.json
@@ -21,12 +21,7 @@
      ],
      "uid": "b535c86a-777b-54c3-b89a-cad528d0580f",
      "name": "EMH 225",
-      "floor": "2",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "floor": "2"
    },
    "frequency": "once",
    "dates": [
@@ -38,12 +33,7 @@
      "name": "Distributed Algorithms",
      "categories": [
        "written exam"
-      ],
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      ]
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
--- a/test/resources/DateSeries.3.json
+++ b/test/resources/DateSeries.3.json
@@ -21,12 +21,7 @@
      ],
      "uid": "b535c86a-777b-54c3-b89a-cad528d0580f",
      "name": "EMH 225",
-      "floor": "2",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "floor": "2"
    },
    "frequency": "once",
    "dates": [
@@ -38,12 +33,7 @@
      "name": "Dance course for beginners",
      "categories": [
        "special"
-      ],
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      ]
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
@@ -62,11 +52,6 @@
        },
        "provider": {
          "name": "Studentenwerk",
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
-          },
          "type": "organization",
          "uid": "3b9b3df6-3a7a-58cc-922f-c7335c002634"
        }
--- a/test/resources/Dish.1.json
+++ b/test/resources/Dish.1.json
@@ -29,11 +29,6 @@
        },
        "provider": {
          "name": "Studentenwerk",
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
-          },
          "type": "organization",
          "uid": "3b9b3df6-3a7a-58cc-922f-c7335c002634"
        },
@@ -63,11 +58,6 @@
            "addressRegion": "Berlin",
            "postalCode": "10623",
            "streetAddress": "Hardenbergstraße 34"
-          },
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
          }
        }
      }
--- a/test/resources/Dish.2.json
+++ b/test/resources/Dish.2.json
@@ -16,11 +16,6 @@
        },
        "provider": {
          "name": "Studentenwerk",
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
-          },
          "type": "organization",
          "uid": "3b9b3df6-3a7a-58cc-922f-c7335c002634"
        },
@@ -53,11 +48,6 @@
            "addressRegion": "Berlin",
            "postalCode": "10623",
            "streetAddress": "Hardenbergstraße 34"
-          },
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
          }
        }
      }
--- a/test/resources/Dish.3.json
+++ b/test/resources/Dish.3.json
@@ -33,11 +33,6 @@
                50.1743717
              ]
            }
-          },
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
          }
        },
        "prices": {
@@ -47,11 +42,6 @@
        },
        "provider": {
          "name": "Studentenwerk",
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
-          },
          "type": "organization",
          "uid": "3b9b3df6-3a7a-58cc-922f-c7335c002634"
        }
@@ -95,12 +85,7 @@
        "name": "Pommes frites",
        "categories": [
          "side dish"
-        ],
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        ]
      },
      {
        "characteristics": [
@@ -128,12 +113,7 @@
        "categories": [
          "side dish",
          "salad"
-        ],
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        ]
      }
    ],
    "type": "dish",
--- a/test/resources/Favorite.json
+++ b/test/resources/Favorite.json
@@ -16,12 +16,7 @@
        "Wirtschaftsmathematik BSc",
        "Technomathematik BSc",
        "Mathematik BSc"
-      ],
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      ]
    },
    "origin": {
      "created": "2018-09-11T12:30:00Z",
--- a/test/resources/Floor.1.json
+++ b/test/resources/Floor.1.json
@@ -164,11 +164,6 @@
        "addressRegion": "Berlin",
        "postalCode": "10623",
        "streetAddress": "Straße des 17. Juni 136"
-      },
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
      }
    },
    "floorName": "0",
@@ -3388,12 +3383,7 @@
            ],
            "uid": "593655b5-0fc9-59de-a82f-b8f5f908deef",
            "name": "MA 043",
-            "floor": "0",
-            "origin": {
-              "indexed": "2018-09-11T12:30:00Z",
-              "name": "Dummy",
-              "type": "remote"
-            }
+            "floor": "0"
          }
        },
        {
@@ -5536,12 +5526,7 @@
            ],
            "uid": "31b1ab4c-1803-51ed-8c66-59bfc97cd350",
            "name": "MA Foyer",
-            "floor": "0",
-            "origin": {
-              "indexed": "2018-09-11T12:30:00Z",
-              "name": "Dummy",
-              "type": "remote"
-            }
+            "floor": "0"
          }
        },
        {
@@ -6355,12 +6340,7 @@
            ],
            "uid": "56ce0744-ae39-5209-b18f-d3a6edcb8f0a",
            "name": "MA 042",
-            "floor": "0",
-            "origin": {
-              "indexed": "2018-09-11T12:30:00Z",
-              "name": "Dummy",
-              "type": "remote"
-            }
+            "floor": "0"
          }
        },
        {
@@ -6470,12 +6450,7 @@
            ],
            "uid": "96b7e555-1214-5ca8-8294-e8209ac04f5a",
            "name": "MA 041",
-            "floor": "0",
-            "origin": {
-              "indexed": "2018-09-11T12:30:00Z",
-              "name": "Dummy",
-              "type": "remote"
-            }
+            "floor": "0"
          }
        },
        {
@@ -6705,12 +6680,7 @@
            ],
            "uid": "ed50a94d-eb06-5d07-8058-dfbdeb6c3a0b",
            "name": "MA 001",
-            "floor": "0",
-            "origin": {
-              "indexed": "2018-09-11T12:30:00Z",
-              "name": "Dummy",
-              "type": "remote"
-            }
+            "floor": "0"
          }
        },
        {
--- a/test/resources/Floor.2.json
+++ b/test/resources/Floor.2.json
@@ -104,11 +104,6 @@
        "addressRegion": "Berlin",
        "postalCode": "10623",
        "streetAddress": "Straße des 17. Juni 135"
-      },
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
      }
    },
    "floorName": "4",
--- a/test/resources/Floor.3.json
+++ b/test/resources/Floor.3.json
@@ -104,11 +104,6 @@
        "addressRegion": "Berlin",
        "postalCode": "10623",
        "streetAddress": "Straße des 17. Juni 135"
-      },
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
      }
    },
    "floorName": "5",
--- a/test/resources/Message.1.json
+++ b/test/resources/Message.1.json
@@ -3,7 +3,7 @@
  "instance": {
    "type": "message",
    "uid": "4706ef24-b631-5c20-91d1-3c627decca5a",
-    "image": "icon ion-android-hand stapps-color-red-dark",
+    "image": "https://backend/res/img/message_small.png",
    "name": "Lösung für das Problem des Zurücksetzens der StApps-App gefunden",
    "message": "Wie bereits berichtet, klagten User über das Löschen ihres Stundenplans beim Update von Version 0.8.0 auf 0.8.1. Wir haben eine Lösung für das Problem gefunden und testen diese ausführlich bis zum Ende dieser Woche. Wenn alles glatt verläuft, dann kommt am Wochenende die fehlerbereinige Version 0.8.2 heraus.\n\n*(25.Okt 2016)*",
    "audiences": [
--- a/test/resources/Message.2.json
+++ b/test/resources/Message.2.json
@@ -5,7 +5,7 @@
  "instance": {
    "type": "invalid-value-in-schema",
    "uid": "cdb7059c-a1a2-5229-821d-434c345e2917",
-    "image": "icon ion-android-hand stapps-color-red-dark",
+    "image": "https://backend/res/img/message_small.png",
    "name": "Lösung für das Problem des Zurücksetzens der StApps-App gefunden",
    "message": "Wie bereits berichtet, klagten User über das Löschen ihres Stundenplans beim Update von Version 0.8.0 auf 0.8.1. Wir haben eine Lösung für das Problem gefunden und testen diese ausführlich bis zum Ende dieser Woche. Wenn alles glatt verläuft, dann kommt am Wochenende die fehlerbereinige Version 0.8.2 heraus.\n\n*(25.Okt 2016)*",
    "audiences": [
--- a/test/resources/Message.3.json
+++ b/test/resources/Message.3.json
@@ -6,7 +6,7 @@
    "type": "message",
    "invalid-non-existing-key-in-schema": 1,
    "uid": "4706ef24-b631-5c20-91d1-3c627decca5a",
-    "image": "icon ion-android-hand stapps-color-red-dark",
+    "image": "https://backend/res/img/message_small.png",
    "name": "Lösung für das Problem des Zurücksetzens der StApps-App gefunden",
    "message": "Wie bereits berichtet, klagten User über das Löschen ihres Stundenplans beim Update von Version 0.8.0 auf 0.8.1. Wir haben eine Lösung für das Problem gefunden und testen diese ausführlich bis zum Ende dieser Woche. Wenn alles glatt verläuft, dann kommt am Wochenende die fehlerbereinige Version 0.8.2 heraus.\n\n*(25.Okt 2016)*",
    "audiences": [
--- a/test/resources/Person.3.json
+++ b/test/resources/Person.3.json
@@ -40,11 +40,6 @@
              ],
              "type": "Point"
            }
-          },
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
          }
        }
      },
@@ -72,11 +67,6 @@
              ],
              "type": "Point"
            }
-          },
-          "origin": {
-            "indexed": "2018-09-11T12:30:00Z",
-            "name": "Dummy",
-            "type": "remote"
          }
        }
      }
--- a/test/resources/PluginRegisterRequest.1.json
+++ b/test/resources/PluginRegisterRequest.1.json
@@ -0,0 +1,74 @@
+{
+  "errorNames": [],
+  "instance": {
+    "action": "add",
+    "plugin": {
+      "address": "http://foo.com:1234",
+      "name": "Foo Plugin",
+      "requestSchema": {
+        "$schema": "http://json-schema.org/draft-06/schema#",
+        "definitions": {
+          "SCFooPluginRequest": {
+            "type": "object",
+            "properties": {
+              "query": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "query"
+            ],
+            "additionalProperties": false,
+            "description": "User query"
+          }
+        },
+        "type": "object",
+        "properties": {
+          "query": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "query"
+        ],
+        "additionalProperties": false,
+        "description": "User query",
+        "id": "https://core.stapps.tu-berlin.de/v0.18.0/lib/schema/SCFooPluginRequest.json"
+      },
+      "responseSchema": {
+        "$schema": "http://json-schema.org/draft-06/schema#",
+        "definitions": {
+          "SCFooPluginResponse": {
+            "type": "object",
+            "properties": {
+              "result": {
+                "type": "array",
+                "items": {}
+              }
+            },
+            "required": [
+              "result"
+            ],
+            "additionalProperties": false,
+            "description": "A response to a query"
+          }
+        },
+        "type": "object",
+        "properties": {
+          "result": {
+            "type": "array",
+            "items": {}
+          }
+        },
+        "required": [
+          "result"
+        ],
+        "additionalProperties": false,
+        "description": "A response to a query",
+        "id": "https://core.stapps.tu-berlin.de/v0.18.0/lib/schema/SCFooPluginResponse.json"
+      },
+      "route": "/foo"
+    }
+  },
+  "schema": "SCPluginRegisterRequest"
+}
--- a/test/resources/PluginRegisterRequest.2.json
+++ b/test/resources/PluginRegisterRequest.2.json
@@ -0,0 +1,8 @@
+{
+  "errorNames": [],
+  "instance": {
+    "action": "remove",
+    "route": "/foo"
+  },
+  "schema": "SCPluginRegisterRequest"
+}
--- a/test/resources/PluginRegisterResponse.1.json
+++ b/test/resources/PluginRegisterResponse.1.json
@@ -0,0 +1,7 @@
+{
+  "errorNames": [],
+  "instance": {
+    "success": true
+  },
+  "schema": "SCPluginRegisterResponse"
+}
--- a/test/resources/PointOfInterest.1.json
+++ b/test/resources/PointOfInterest.1.json
@@ -98,12 +98,7 @@
        "library"
      ],
      "type": "building",
-      "uid": "65596790-a217-5d70-888e-16aa17bfda0a",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "uid": "65596790-a217-5d70-888e-16aa17bfda0a"
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
--- a/test/resources/PointOfInterest.2.json
+++ b/test/resources/PointOfInterest.2.json
@@ -286,12 +286,7 @@
      "categories": [
        "education"
      ],
-      "uid": "a825451c-cbc4-544a-9d96-9de0b635fdbd",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "uid": "a825451c-cbc4-544a-9d96-9de0b635fdbd"
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
--- a/test/resources/Room.3.json
+++ b/test/resources/Room.3.json
@@ -177,11 +177,6 @@
        "addressRegion": "Berlin",
        "postalCode": "10623",
        "streetAddress": "Straße des 17. Juni 136"
-      },
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
      }
    },
    "floor": "0",
--- a/test/resources/Room.4.json
+++ b/test/resources/Room.4.json
@@ -67,12 +67,7 @@
        "education"
      ],
      "type": "building",
-      "uid": "583b4bd4-d7b7-5736-b2df-87e05c41d97a",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "uid": "583b4bd4-d7b7-5736-b2df-87e05c41d97a"
    },
    "origin": {
      "indexed": "2018-09-11T12:30:00Z",
--- a/test/resources/Ticket.json
+++ b/test/resources/Ticket.json
@@ -26,12 +26,7 @@
        "H 0010"
      ],
      "name": "Prüfungsamt - Team 2",
-      "floor": "0",
-      "origin": {
-        "indexed": "2018-09-11T12:30:00Z",
-        "name": "Dummy",
-        "type": "remote"
-      }
+      "floor": "0"
    },
    "serviceType": {
      "name": "Prüfungsamt"
--- a/test/resources/Video.2.json
+++ b/test/resources/Video.2.json
@@ -35,12 +35,7 @@
        "uid": "540862f3-ea30-5b8f-8678-56b4dc217642",
        "name": "Big Buck Bunny",
        "givenName": "Big Buck",
-        "familyName": "Bunny",
-        "origin": {
-          "indexed": "2018-09-11T12:30:00Z",
-          "name": "Dummy",
-          "type": "remote"
-        }
+        "familyName": "Bunny"
      }
    ],
    "origin": {
Author	SHA1	Message	Date
Jovan Krunić	68c5fcacbb	0.19.0	2019-05-17 12:33:37 +02:00
Karl-Philipp Wulfert	56d43bb59a	build: update dependencies	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	2ad314eda6	docs: correct copyright years	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	f2a86fb6bd	test: add tests to ensure consistency of model	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	198f48add4	test: adjust tests	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	5e29203e3d	test: make sure to write report	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	ca72c20bd0	fix: adjust model to remove references from things without references Fixes #69	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	da0507ee34	fix: add thing without references, split thing References #69	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	1a73208c6f	style: correct indentation and format in Thing.ts	2019-05-17 08:50:20 +00:00
Karl-Philipp Wulfert	1d6a2b7841	fix: remove references from origins References #69	2019-05-17 08:50:20 +00:00
Jovan Krunić	e3d3d022c7	test: add test files for plugin routes	2019-05-16 17:05:25 +02:00
Jovan Krunić	bff6079f60	refactor: add plugin meta data interface Closes #67	2019-05-16 17:05:24 +02:00
Jovan Krunić	bac09ffebc	refactor: unify use of the image field Closes #44	2019-05-15 14:22:35 +02:00
Karl-Philipp Wulfert	1c5a931e09	docs: update changelog	2019-05-14 14:42:41 +02:00