{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://readium.org/webpub-manifest/schema/extensions/epub/properties.schema.json",
  "title": "EPUB Profile - Link Properties",
  "type": "object",
  "properties": {
    "contains": {
      "description": "Identifies content contained in the linked resource, that cannot be strictly identified using a media type.",
      "type": "array",
      "items": {
        "type": "string",
        "enum": [
          "mathml", 
          "onix", 
          "remote-resources",
          "js",
          "svg",
          "xmp"
        ]
      },
      "uniqueItems": true
    }
  }
}