{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "5.2-pageFirstValidated.json",
  "assertionType": "must",
  "expectedResult": "valid",
  "onUnexpectedResult" : "failAndContinue",
  "errorMessage": "ERROR: Annotation Page has invalid first key (i.e., in description of Collection included using partOf key).",
  "title": "**Annotation Page _first_ key** (i.e., in description of Collection included using partOf key), if present, has value of string of format uri - [model 5.2](https://www.w3.org/TR/annotation-model/#annotation-page)",
  "type": "object",
  "properties":
  {
    "partOf":
           { "$ref": "collections.json#/definitions/firstValidIfPresent" }
  }
}
