json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Descriptor",
      "description": "Defines the semantics of specific data elements or state transitions that MAY exist in an associated representation.",
      "type": "object",
      "properties": {
          "links": {
              "type": "array",
              "items": {
                  "type": "object",
                  "properties": {
                      "rel": {
                          "type": "string",
                          "description": "A [RFC5988][] approved relation type."
                      },
                      "href": {
                          "type": "string",
                          "description": "The URL of the resource described by the associated `rel`."
                      }
                  },
                  "required": [
                      "rel",
                      "href"
                  ],
                  "description": "Identifies a link between an ALPS element and some other (possibly external) resource.\n\n"
              },
              "description": "Links to other related resources."
          },
          "descriptors": {
              "type": "array",
              "items": {
                  "description": "Defines the semantics of specific data elements or state transitions that MAY exist in an associated representation.\n\n"
              },
              "description": "Data and transition definitions."
          },
          "doc": {
              "type": "object",
              "properties": {
                  "format": {
                      "enum": [
                          "text",
                          "html",
                          "asciidoc"
                      ],
                      "description": "Indicates how the content should be parsed."
                  },
                  "href": {
                      "type": "string",
                      "description": "References a related document containing human readable text."
                  },
                  "content": {
                      "type": "string",
                      "description": "The text contents."
                  }
              },
              "description": "A description of the element."
          },
          "ext": {
              "type": "object",
              "properties": {
                  "id": {
                      "type": "string",
                      "description": "A document-wide unique identifier for the extension element."
                  },
                  "href": {
                      "type": "string",
                      "description": "References the definition of the extension."
                  },
                  "value": {
                      "type": "string",
                      "description": "Specifies the value."
                  }
              },
              "required": [
                  "id"
              ],
              "description": "Author-specific extension to an element."
          },
          "id": {
              "type": "string",
              "description": "A document-wide unique identifier for the descriptor element."
          },
          "name": {
              "type": "string",
              "description": "A name for a descriptor element."
          },
          "type": {
              "enum": [
                  "semantic",
                  "safe",
                  "idempotent",
                  "unsafe"
              ],
              "description": "The type of hypermedia control within the associated representation."
          },
          "rt": {
              "type": "string",
              "description": "ID of another descriptor in the document. Valid for `safe`, `idempotent` and `unsafe` types."
          }
      }
  }