json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Predicate definition",
      "type": "object",
      "properties": {
          "name": {
              "title": "Predicate Name",
              "description": "Unique name of a predicate",
              "type": "string",
              "minLength": 1
          },
          "description": {
              "title": "Predicate description",
              "description": "Short description of the predicate meaning",
              "type": "string",
              "minLength": 1
          }
      },
      "required": [
          "name",
          "description"
      ],
      "additionalProperties": false
  }