schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://stac-extensions.github.io/alternate-assets/v1.2.0/schema.json#",
  "title": "Alternate Assets Extension",
  "description": "STAC Alternate Assets Extension for STAC Items and STAC Collections.",
  "type": "object",
  "required": ["stac_extensions"],
  "properties": {
    "stac_extensions": {
      "type": "array",
      "contains": {
        "const": "https://stac-extensions.github.io/alternate-assets/v1.2.0/schema.json"
      }
    }
  },
  "oneOf": [
    {
      "$comment": "This is the schema for STAC Items.",
      "type": "object",
      "required": ["type", "assets"],
      "properties": {
        "type": {
          "const": "Feature"
        },
        "assets": {
          "type": "object",
          "properties": {
            "alternate:name": {
              "$ref": "#/definitions/name"
            },
            "alternate": {
              "$ref": "#/definitions/alternate_assets"
            }
          }
        }
      }
    },
    {
      "$comment": "This is the schema for STAC Collections.",
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "const": "Collection"
        },
        "assets": {
          "$ref": "#/definitions/assets"
        },
        "item_assets": {
          "type": "object",
          "additionalProperties": {
            "properties": {
              "alternate:name": {
                "$ref": "#/definitions/name"
              },
              "alternate": {
                "$ref": "#/definitions/alternate_item_assets"
              }
            }
          }
        }
      }
    }
  ],
  "definitions": {
    "name": {
      "type": "string",
      "minLength": 1
    },
    "object_without_href": {
      "type": "object",
      "properties": {
        "alternate:name": {
          "$ref": "#/definitions/name"
        }
      },
      "allOf": [
        {
          "$ref": "https://schemas.stacspec.org/v1.0.0/item-spec/json-schema/basics.json"
        }
      ]
    },
    "assets": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "properties": {
          "alternate:name": {
            "$ref": "#/definitions/name"
          },
          "alternate": {
            "$ref": "#/definitions/alternate_assets"
          }
        }
      }
    },
    "alternate_assets": {
      "type": "object",
      "minProperties": 1,
      "additionalProperties": {
        "allOf": [
          {
            "$comment": "Require href in alternate assets in normal assets",
            "type": "object",
            "required": ["href"],
            "properties": {
              "href": {
                "type": "string",
                "format": "iri-reference",
                "minLength": 1
              }
            }
          },
          {
            "$ref": "#/definitions/object_without_href"
          }
        ]
      }
    },
    "alternate_item_assets": {
      "type": "object",
      "minProperties": 1,
      "additionalProperties": {
        "allOf": [
          {
            "$comment": "Disallow href in alternate assets in item assets",
            "type": "object",
            "properties": {
              "href": {
                "not": {}
              }
            }
          },
          {
            "$ref": "#/definitions/object_without_href"
          }
        ]
      }
    }
  }
}