{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openbrandexchange.com/schemas/v0.1/Variant.json",
  "type": "object",
  "title": "Variant",
  "description": "A sellable colour/size combination of a product.",
  "properties": {
    "id": {
      "$ref": "Common.json#/$defs/Id"
    },
    "external_id": {
      "$ref": "Common.json#/$defs/ExternalId"
    },
    "product_id": {
      "$ref": "Common.json#/$defs/Id"
    },
    "brand_id": {
      "$ref": "Common.json#/$defs/Id"
    },
    "gtin": {
      "anyOf": [
        {
          "$ref": "Common.json#/$defs/Gtin14",
          "description": "Normalised GTIN-14. The consumer's match key."
        },
        {
          "type": "null"
        }
      ]
    },
    "gtin_original": {
      "anyOf": [
        {
          "$ref": "Common.json#/$defs/GtinInput",
          "description": "GTIN exactly as the brand supplied it (e.g. 13-digit EAN)."
        },
        {
          "type": "null"
        }
      ]
    },
    "sku": {
      "type": [
        "string",
        "null"
      ],
      "description": "The brand's article/SKU number for this variant.",
      "maxLength": 200
    },
    "color": {
      "$ref": "Color.json"
    },
    "size": {
      "type": [
        "string",
        "null"
      ],
      "description": "Size label, e.g. 'M', '42', '32/34', 'ONE SIZE'.",
      "maxLength": 64
    },
    "size_system": {
      "type": [
        "string",
        "null"
      ],
      "description": "Optional size system, e.g. EU, UK, US, INT, FR, IT.",
      "maxLength": 16
    },
    "updated_at": {
      "$ref": "Common.json#/$defs/DateTime"
    }
  },
  "required": [
    "id",
    "external_id",
    "product_id",
    "brand_id",
    "color",
    "updated_at"
  ],
  "additionalProperties": false,
  "patternProperties": {
    "^x-[a-z0-9]+-[a-z0-9_-]+$": true
  }
}