json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Claim",
      "description": "Claim provided by a service",
      "type": "object",
      "properties": {
          "claimant": {
              "description": "Short name of the service used for subscription",
              "value": "string"
          },
          "subject": {
              "description": "subject of the predicate (claim)",
              "type": "object",
              "properties": {
                  "type": {
                      "description": "Type of persistent identifier (e.g. INSPIRE_RECORD_ID)",
                      "type": "string"
                  },
                  "value": {
                      "description": "Actual value of the identifier",
                      "type": "string"
                  }
              },
              "required": [
                  "type",
                  "value"
              ],
              "additionalProperties": false
          },
          "claim": {
              "description": "type of claim",
              "type": "object",
              "properties": {
                  "predicate": {
                      "description": "predicate of the claim",
                      "type": "string",
                      "enum": [
                          "is_same_as",
                          "is_different_than",
                          "is_erratum_of",
                          "is_superseded_by",
                          "is_cited_by",
                          "is_software_for",
                          "is_dataset_for"
                      ]
                  },
                  "datetime": {
                      "description": "#TODO: which date time is this?",
                      "type": "string"
                  },
                  "certainty": {
                      "description": "certainty of the claim",
                      "type": "number",
                      "minimum": 0,
                      "maximum": 100
                  },
                  "arguments": {
                      "description": "arguments supporting the certainty",
                      "type": "object",
                      "properties": {
                          "human": {
                              "description": "the claim was done by a human or an algorithm",
                              "type": "string",
                              "enum": [
                                  "True",
                                  "False"
                              ]
                          },
                          "actor": {
                              "description": "who assessed the certainty",
                              "type": "string"
                          },
                          "role": {
                              "description": "role of the actor",
                              "type": "string"
                          }
                      }
                  }
              },
              "required": [
                  "predicate",
                  "certainty"
              ]
          },
          "object": {
              "description": "object of the predicate (claim)",
              "type": "object",
              "properties": {
                  "type": {
                      "description": "Type of persistent identifier (e.g. INSPIRE_RECORD_ID)",
                      "type": "string"
                  },
                  "value": {
                      "description": "Actual value of the identifier",
                      "type": "string"
                  }
              },
              "required": [
                  "type",
                  "value"
              ],
              "additionalProperties": false
          }
      },
      "required": [
          "claimant",
          "subject",
          "claim",
          "object"
      ],
      "additionalProperties": false
  }