{
  "id": "keyword.json#",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "description": "schema for a keyword entry",
  "type": "object",
  "required": ["keyword"],
  "additionalProperties": false,
  "properties": {
    "keyword": {
      "type": "array",
      "description": "Commonly used word(s) or formalized word(s) or phrase(s) used to describe the subject.",
      "translation": {
        "ISO 19115-2": ["MD_Keywords > keyword"],
        "FGDC CSDGM": ["idinfo>keywords>theme>themekey", "idinfo>keywords>place>placekey", "idinfo>keywords>temporal>tempkey", "idinfo>keywords>stratum>stratkey"]
      },
      "items": {
        "type": "string"
      },
      "uniqueItems": true
    },
    "keywordType": {
      "type": "string",
      "description": "A code, or concept, that defines the subject matter used to group similar keywords.",
      "translation": {
        "ISO 19115-2": ["MD_Keywords > type"]
      }
    },
    "thesaurus": {
      "description": "Name of the formally registered thesaurus or a similar authoritative source of keywords.",
      "translation": {
        "ISO 19115-2": ["MD_Keywords > thesaurusName > CI_Citation"],
        "FGDC CSDGM": ["idinfo>keywords>theme>themekt", "idinfo>keywords>place>placekt", "idinfo>keywords>temporal>tempkt", "idinfo>keywords>stratum>stratkt"]
      },
      "$ref": "citation.json#/definitions/citationFull"
    }
  }
}