json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "description": "An identifier for an entity (possibly other things, e.g. securities in the future). Examples are tax IDs, non-profit IDs, SEC CIK numbers, Federal Reserve RSSD id. The main requirements for an identifier is that they should be well-defined, and issued by a government or have statutory standing",
      "type": "object",
      "properties": {
          "uid": {
              "type": "string",
              "description": "The unique identifier given by the identifier system \u2013 it should be unique in the context of the identifier_system",
              "minLength": 1
          },
          "identifier_system_code": {
              "type": "string",
              "description": "An identifier representing the identifier scheme. Some examples of this are us_fein (US Federal tax number), us_sec_cik (US Securities and Exchange Commission CIK), uk_ew_cc (Charity Commission of England & Wales), lei (Global Legal Entity Identifier System)"
          }
      },
      "required": [
          "uid",
          "identifier_system_code"
      ]
  }