{
  "title": "Thing Description",
  "version": "1.1-12-March-2025",
  "description": "JSON Schema for validating TD instances against the TD information model. TD instances can be with or without terms that have default values",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/w3c/wot-thing-description/main/validation/td-json-schema-validation.json",
  "definitions": {
    "anyUri": {
      "type": "string"
    },
    "description": {
      "type": "string"
    },
    "descriptions": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      }
    },
    "title": {
      "type": "string"
    },
    "titles": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      }
    },
    "security": {
      "oneOf": [
        {
          "type": "array",
          "items": {
            "type": "string"
          },
          "minItems": 1
        },
        {
          "type": "string"
        }
      ]
    },
    "scopes": {
      "oneOf": [
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        {
          "type": "string"
        }
      ]
    },
    "subprotocol": {
      "type": "string",
      "examples": ["longpoll", "websub", "sse"]
    },
    "thing-context-td-uri-v1": {
      "type": "string",
      "const": "https://www.w3.org/2019/wot/td/v1"
    },
    "thing-context-td-uri-v1.1": {
      "type": "string",
      "const": "https://www.w3.org/2022/wot/td/v1.1"
    },
    "thing-context-td-uri-temp": {
      "type": "string",
      "const": "https://www.w3.org/ns/wot-next/td"
    },
    "thing-context": {
      "$comment": "Experimental context URI with other vocabularies after it",
      "type": "array",
      "items": [
        {
          "$ref": "#/definitions/thing-context-td-uri-temp"
        }
      ],
      "additionalItems": {
        "anyOf": [
          {
            "$ref": "#/definitions/anyUri"
          },
          {
            "type": "object",
            "additionalProperties": {
              "type": "string"
            }
          }
        ]
      }
    },
    "bcp47_string": {
      "type": "string",
      "pattern": "^(((([A-Za-z]{2,3}(-([A-Za-z]{3}(-[A-Za-z]{3}){0,2}))?)|[A-Za-z]{4}|[A-Za-z]{5,8})(-([A-Za-z]{4}))?(-([A-Za-z]{2}|[0-9]{3}))?(-([A-Za-z0-9]{5,8}|[0-9][A-Za-z0-9]{3}))*(-([0-9A-WY-Za-wy-z](-[A-Za-z0-9]{2,8})+))*(-(x(-[A-Za-z0-9]{1,8})+))?)|(x(-[A-Za-z0-9]{1,8})+)|((en-GB-oed|i-ami|i-bnn|i-default|i-enochian|i-hak|i-klingon|i-lux|i-mingo|i-navajo|i-pwn|i-tao|i-tay|i-tsu|sgn-BE-FR|sgn-BE-NL|sgn-CH-DE)|(art-lojban|cel-gaulish|no-bok|no-nyn|zh-guoyu|zh-hakka|zh-min|zh-min-nan|zh-xiang)))$"
    },
    "type_declaration": {
      "oneOf": [
        {
          "type": "string",
          "not": {
            "const": "tm:ThingModel"
          }
        },
        {
          "type": "array",
          "items": {
            "type": "string",
            "not": {
              "const": "tm:ThingModel"
            }
          }
        }
      ]
    },
    "dataSchema-type": {
      "type": "string",
      "enum": ["boolean", "integer", "number", "string", "object", "array", "null"]
    },
    "dataSchema": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "title": {
          "$ref": "#/definitions/title"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "titles": {
          "$ref": "#/definitions/titles"
        },
        "writeOnly": {
          "type": "boolean"
        },
        "readOnly": {
          "type": "boolean"
        },
        "oneOf": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "unit": {
          "type": "string"
        },
        "enum": {
          "type": "array",
          "minItems": 1,
          "uniqueItems": true
        },
        "format": {
          "type": "string"
        },
        "const": {},
        "default": {},
        "contentEncoding": {
          "type": "string"
        },
        "contentMediaType": {
          "type": "string"
        },
        "type": {
          "$ref": "#/definitions/dataSchema-type"
        },
        "items": {
          "oneOf": [
            {
              "$ref": "#/definitions/dataSchema"
            },
            {
              "type": "array",
              "items": {
                "$ref": "#/definitions/dataSchema"
              }
            }
          ]
        },
        "maxItems": {
          "type": "integer",
          "minimum": 0
        },
        "minItems": {
          "type": "integer",
          "minimum": 0
        },
        "minimum": {
          "type": "number"
        },
        "maximum": {
          "type": "number"
        },
        "exclusiveMinimum": {
          "type": "number"
        },
        "exclusiveMaximum": {
          "type": "number"
        },
        "minLength": {
          "type": "integer",
          "minimum": 0
        },
        "maxLength": {
          "type": "integer",
          "minimum": 0
        },
        "multipleOf": {
          "$ref": "#/definitions/multipleOfDefinition"
        },
        "properties": {
          "additionalProperties": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "required": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      }
    },
    "additionalResponsesDefinition": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "contentType": {
            "type": "string"
          },
          "schema": {
            "type": "string"
          },
          "success": {
            "type": "boolean"
          }
        }
      }
    },
    "multipleOfDefinition": {
      "type": ["integer", "number"],
      "exclusiveMinimum": 0
    },
    "expectedResponse": {
      "type": "object",
      "properties": {
        "contentType": {
          "type": "string"
        }
      }
    },
    "form_element_base": {
      "type": "object",
      "properties": {
        "op": {
          "oneOf": [
            {
              "type": "string"
            },
            {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          ]
        },
        "href": {
          "$ref": "#/definitions/anyUri"
        },
        "contentType": {
          "type": "string"
        },
        "contentCoding": {
          "type": "string"
        },
        "subprotocol": {
          "$ref": "#/definitions/subprotocol"
        },
        "security": {
          "$ref": "#/definitions/security"
        },
        "scopes": {
          "$ref": "#/definitions/scopes"
        },
        "response": {
          "$ref": "#/definitions/expectedResponse"
        },
        "additionalResponses": {
          "$ref": "#/definitions/additionalResponsesDefinition"
        }
      },
      "required": ["href"],
      "additionalProperties": true
    },
    "form_element_property": {
      "allOf": [{ "$ref": "#/definitions/form_element_base" }],
      "type": "object",
      "properties": {
        "op": {
          "oneOf": [
            {
              "type": "string",
              "enum": ["readproperty", "writeproperty", "observeproperty", "unobserveproperty"]
            },
            {
              "type": "array",
              "items": {
                "type": "string",
                "enum": ["readproperty", "writeproperty", "observeproperty", "unobserveproperty"]
              },
              "minItems": 1
            }
          ]
        }
      },
      "additionalProperties": true
    },
    "form_element_action": {
      "allOf": [{ "$ref": "#/definitions/form_element_base" }],
      "type": "object",
      "properties": {
        "op": {
          "oneOf": [
            {
              "type": "string",
              "enum": ["invokeaction", "queryaction", "cancelaction"]
            },
            {
              "type": "array",
              "items": {
                "type": "string",
                "enum": ["invokeaction", "queryaction", "cancelaction"]
              },
              "minItems": 1
            }
          ]
        }
      },
      "additionalProperties": true
    },
    "form_element_event": {
      "allOf": [{ "$ref": "#/definitions/form_element_base" }],
      "type": "object",
      "properties": {
        "op": {
          "oneOf": [
            {
              "type": "string",
              "enum": ["subscribeevent", "unsubscribeevent"]
            },
            {
              "type": "array",
              "items": {
                "type": "string",
                "enum": ["subscribeevent", "unsubscribeevent"]
              },
              "minItems": 1
            }
          ]
        }
      },
      "additionalProperties": true
    },
    "form_element_root": {
      "allOf": [{ "$ref": "#/definitions/form_element_base" }],
      "type": "object",
      "properties": {
        "op": {
          "oneOf": [
            {
              "type": "string",
              "enum": [
                "readallproperties",
                "writeallproperties",
                "readmultipleproperties",
                "writemultipleproperties",
                "observeallproperties",
                "unobserveallproperties",
                "queryallactions",
                "subscribeallevents",
                "unsubscribeallevents"
              ]
            },
            {
              "type": "array",
              "items": {
                "type": "string",
                "enum": [
                  "readallproperties",
                  "writeallproperties",
                  "readmultipleproperties",
                  "writemultipleproperties",
                  "observeallproperties",
                  "unobserveallproperties",
                  "queryallactions",
                  "subscribeallevents",
                  "unsubscribeallevents"
                ]
              },
              "minItems": 1
            }
          ]
        }
      },
      "additionalProperties": true,
      "required": ["op"]
    },
    "form": {
      "$comment": "This is NOT for validation purposes but for automatic generation of TS types. For more info, please see: https://github.com/w3c/wot-thing-description/pull/1319#issuecomment-994950057",
      "oneOf": [
        { "$ref": "#/definitions/form_element_property" },
        { "$ref": "#/definitions/form_element_action" },
        { "$ref": "#/definitions/form_element_event" },
        { "$ref": "#/definitions/form_element_root" }
      ]
    },
    "property_element": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "title": {
          "$ref": "#/definitions/title"
        },
        "titles": {
          "$ref": "#/definitions/titles"
        },
        "forms": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/form_element_property"
          }
        },
        "uriVariables": {
          "type": "object",
          "additionalProperties": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "observable": {
          "type": "boolean"
        },
        "writeOnly": {
          "type": "boolean"
        },
        "readOnly": {
          "type": "boolean"
        },
        "oneOf": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "unit": {
          "type": "string"
        },
        "enum": {
          "type": "array",
          "minItems": 1,
          "uniqueItems": true
        },
        "format": {
          "type": "string"
        },
        "const": {},
        "default": {},
        "type": {
          "$ref": "#/definitions/dataSchema-type"
        },
        "items": {
          "oneOf": [
            {
              "$ref": "#/definitions/dataSchema"
            },
            {
              "type": "array",
              "items": {
                "$ref": "#/definitions/dataSchema"
              }
            }
          ]
        },
        "maxItems": {
          "type": "integer",
          "minimum": 0
        },
        "minItems": {
          "type": "integer",
          "minimum": 0
        },
        "minimum": {
          "type": "number"
        },
        "maximum": {
          "type": "number"
        },
        "exclusiveMinimum": {
          "type": "number"
        },
        "exclusiveMaximum": {
          "type": "number"
        },
        "minLength": {
          "type": "integer",
          "minimum": 0
        },
        "maxLength": {
          "type": "integer",
          "minimum": 0
        },
        "multipleOf": {
          "$ref": "#/definitions/multipleOfDefinition"
        },
        "properties": {
          "additionalProperties": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "required": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "required": ["forms"],
      "additionalProperties": true
    },
    "action_element": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "title": {
          "$ref": "#/definitions/title"
        },
        "titles": {
          "$ref": "#/definitions/titles"
        },
        "forms": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/form_element_action"
          }
        },
        "uriVariables": {
          "type": "object",
          "additionalProperties": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "input": {
          "$ref": "#/definitions/dataSchema"
        },
        "output": {
          "$ref": "#/definitions/dataSchema"
        },
        "safe": {
          "type": "boolean"
        },
        "idempotent": {
          "type": "boolean"
        },
        "synchronous": {
          "type": "boolean"
        }
      },
      "required": ["forms"],
      "additionalProperties": true
    },
    "event_element": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "title": {
          "$ref": "#/definitions/title"
        },
        "titles": {
          "$ref": "#/definitions/titles"
        },
        "forms": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/form_element_event"
          }
        },
        "uriVariables": {
          "type": "object",
          "additionalProperties": {
            "$ref": "#/definitions/dataSchema"
          }
        },
        "subscription": {
          "$ref": "#/definitions/dataSchema"
        },
        "data": {
          "$ref": "#/definitions/dataSchema"
        },
        "dataResponse": {
          "$ref": "#/definitions/dataSchema"
        },
        "cancellation": {
          "$ref": "#/definitions/dataSchema"
        }
      },
      "required": ["forms"],
      "additionalProperties": true
    },
    "base_link_element": {
      "type": "object",
      "properties": {
        "href": {
          "$ref": "#/definitions/anyUri"
        },
        "type": {
          "type": "string"
        },
        "rel": {
          "type": "string"
        },
        "anchor": {
          "$ref": "#/definitions/anyUri"
        },
        "hreflang": {
          "anyOf": [
            { "$ref": "#/definitions/bcp47_string" },
            {
              "type": "array",
              "items": {
                "$ref": "#/definitions/bcp47_string"
              }
            }
          ]
        }
      },
      "required": ["href"],
      "additionalProperties": true
    },
    "link_element": {
      "allOf": [
        {
          "$ref": "#/definitions/base_link_element"
        },
        {
          "not": {
            "description": "A basic link element should not contain sizes",
            "type": "object",
            "properties": {
              "sizes": {}
            },
            "required": ["sizes"]
          }
        },
        {
          "not": {
            "description": "A basic link element should not contain icon or tm:extends",
            "properties": {
              "rel": {
                "enum": ["icon", "tm:extends"]
              }
            },
            "required": ["rel"]
          }
        }
      ]
    },
    "icon_link_element": {
      "allOf": [
        {
          "$ref": "#/definitions/base_link_element"
        },
        {
          "properties": {
            "rel": {
              "const": "icon"
            },
            "sizes": {
              "type": "string",
              "pattern": "[0-9]*x[0-9]+"
            }
          },
          "required": ["rel"]
        }
      ]
    },
    "additionalSecurityScheme": {
      "description": "Applies to additional SecuritySchemes not defined in the WoT TD specification.",
      "$comment": "Additional SecuritySchemes should always be defined via a context extension, using a prefixed value for the scheme. This prefix (e.g. 'ace', see the example below) must contain at least one character in order to reference a valid JSON-LD context extension.",
      "examples": [
        {
          "scheme": "ace:ACESecurityScheme",
          "ace:as": "coaps://as.example.com/token",
          "ace:audience": "coaps://rs.example.com",
          "ace:scopes": ["limited", "special"],
          "ace:cnonce": true
        }
      ],
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "pattern": ".+:.*"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "noSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["nosec"]
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "autoSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["auto"]
        }
      },
      "not": {
        "required": ["name"]
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "comboSecurityScheme": {
      "oneOf": [
        {
          "type": "object",
          "properties": {
            "@type": {
              "$ref": "#/definitions/type_declaration"
            },
            "description": {
              "$ref": "#/definitions/description"
            },
            "descriptions": {
              "$ref": "#/definitions/descriptions"
            },
            "proxy": {
              "$ref": "#/definitions/anyUri"
            },
            "scheme": {
              "type": "string",
              "enum": ["combo"]
            },
            "oneOf": {
              "type": "array",
              "minItems": 2,
              "items": {
                "type": "string"
              }
            }
          },
          "required": ["scheme", "oneOf"],
          "additionalProperties": true
        },
        {
          "type": "object",
          "properties": {
            "@type": {
              "$ref": "#/definitions/type_declaration"
            },
            "description": {
              "$ref": "#/definitions/description"
            },
            "descriptions": {
              "$ref": "#/definitions/descriptions"
            },
            "proxy": {
              "$ref": "#/definitions/anyUri"
            },
            "scheme": {
              "type": "string",
              "enum": ["combo"]
            },
            "allOf": {
              "type": "array",
              "minItems": 2,
              "items": {
                "type": "string"
              }
            }
          },
          "required": ["scheme", "allOf"],
          "additionalProperties": true
        }
      ]
    },
    "basicSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["basic"]
        },
        "in": {
          "type": "string",
          "enum": ["header", "query", "body", "cookie", "auto"]
        },
        "name": {
          "type": "string"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "digestSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["digest"]
        },
        "qop": {
          "type": "string",
          "enum": ["auth", "auth-int"]
        },
        "in": {
          "type": "string",
          "enum": ["header", "query", "body", "cookie", "auto"]
        },
        "name": {
          "type": "string"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "apiKeySecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["apikey"]
        },
        "in": {
          "type": "string",
          "enum": ["header", "query", "body", "cookie", "uri", "auto"]
        },
        "name": {
          "type": "string"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "bearerSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["bearer"]
        },
        "authorization": {
          "$ref": "#/definitions/anyUri"
        },
        "alg": {
          "type": "string"
        },
        "format": {
          "type": "string"
        },
        "in": {
          "type": "string",
          "enum": ["header", "query", "body", "cookie", "auto"]
        },
        "name": {
          "type": "string"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "pskSecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["psk"]
        },
        "identity": {
          "type": "string"
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "oAuth2SecurityScheme": {
      "type": "object",
      "properties": {
        "@type": {
          "$ref": "#/definitions/type_declaration"
        },
        "description": {
          "$ref": "#/definitions/description"
        },
        "descriptions": {
          "$ref": "#/definitions/descriptions"
        },
        "proxy": {
          "$ref": "#/definitions/anyUri"
        },
        "scheme": {
          "type": "string",
          "enum": ["oauth2"]
        },
        "authorization": {
          "$ref": "#/definitions/anyUri"
        },
        "token": {
          "$ref": "#/definitions/anyUri"
        },
        "refresh": {
          "$ref": "#/definitions/anyUri"
        },
        "scopes": {
          "oneOf": [
            {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            {
              "type": "string"
            }
          ]
        },
        "flow": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "string",
              "enum": ["code", "client"]
            }
          ]
        }
      },
      "required": ["scheme"],
      "additionalProperties": true
    },
    "securityScheme": {
      "oneOf": [
        {
          "$ref": "#/definitions/noSecurityScheme"
        },
        {
          "$ref": "#/definitions/autoSecurityScheme"
        },
        {
          "$ref": "#/definitions/comboSecurityScheme"
        },
        {
          "$ref": "#/definitions/basicSecurityScheme"
        },
        {
          "$ref": "#/definitions/digestSecurityScheme"
        },
        {
          "$ref": "#/definitions/apiKeySecurityScheme"
        },
        {
          "$ref": "#/definitions/bearerSecurityScheme"
        },
        {
          "$ref": "#/definitions/pskSecurityScheme"
        },
        {
          "$ref": "#/definitions/oAuth2SecurityScheme"
        },
        {
          "$ref": "#/definitions/additionalSecurityScheme"
        }
      ]
    }
  },
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "format": "uri"
    },
    "title": {
      "$ref": "#/definitions/title"
    },
    "titles": {
      "$ref": "#/definitions/titles"
    },
    "properties": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/property_element"
      }
    },
    "actions": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/action_element"
      }
    },
    "events": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/event_element"
      }
    },
    "description": {
      "$ref": "#/definitions/description"
    },
    "descriptions": {
      "$ref": "#/definitions/descriptions"
    },
    "version": {
      "type": "object",
      "properties": {
        "instance": {
          "type": "string"
        },
        "model": {
          "type": "string"
        }
      },
      "required": ["instance"]
    },
    "links": {
      "type": "array",
      "items": {
        "oneOf": [
          {
            "$ref": "#/definitions/link_element"
          },
          {
            "$ref": "#/definitions/icon_link_element"
          }
        ]
      }
    },
    "forms": {
      "type": "array",
      "minItems": 1,
      "items": {
        "$ref": "#/definitions/form_element_root"
      }
    },
    "base": {
      "$ref": "#/definitions/anyUri"
    },
    "securityDefinitions": {
      "type": "object",
      "minProperties": 1,
      "additionalProperties": {
        "$ref": "#/definitions/securityScheme"
      }
    },
    "schemaDefinitions": {
      "type": "object",
      "minProperties": 1,
      "additionalProperties": {
        "$ref": "#/definitions/dataSchema"
      }
    },
    "support": {
      "$ref": "#/definitions/anyUri"
    },
    "created": {
      "type": "string",
      "format": "date-time"
    },
    "modified": {
      "type": "string",
      "format": "date-time"
    },
    "profile": {
      "oneOf": [
        {
          "$ref": "#/definitions/anyUri"
        },
        {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/definitions/anyUri"
          }
        }
      ]
    },
    "security": {
      "oneOf": [
        {
          "type": "string"
        },
        {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "string"
          }
        }
      ]
    },
    "uriVariables": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/dataSchema"
      }
    },
    "@type": {
      "$ref": "#/definitions/type_declaration"
    },
    "@context": {
      "$ref": "#/definitions/thing-context"
    }
  },
  "required": ["title", "security", "securityDefinitions", "@context"],
  "additionalProperties": true
}