json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "description": "An industry code from a standard code list (e.g. NAICS 2007 or NACE 2). This schema is a sub-schema of Classification.",
      "type": "object",
      "properties": {
          "name": {
              "type": "string"
          },
          "code": {
              "type": "string"
          },
          "code_scheme_id": {
              "type": "string",
              "description": "An identifier representing industry code scheme. At the moment these are eu_nace_2, uk_sic_2003, uk_sic_2007, us_naics_2002, us_naics_2007, be_nace_2008, dk_db_2007, nz_bic_2006, no_sic_2007, anz_sic_2006, nz_bic_2006, in_nic_2004_mca, ca_qc_cae, lu_nace_2. For other code schemes, or details of these, contact info@opencorporates.com"
          },
          "start_date": {
              "type": "string",
              "format": "date"
          },
          "end_date": {
              "type": "string",
              "format": "date"
          }
      },
      "required": [
          "code",
          "code_scheme_id"
      ]
  }