{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "3.3.1-collectionModifiedValidated.json",
  "assertionType": "must",
  "expectedResult": "valid",
  "onUnexpectedResult" : "failAndContinue",
  "errorMessage": "ERROR: Annotation Collection has multiple modified key values or a single modified key value that is not of format date-time.",
  "title": "If present the Annotation Collection-level **_modified_ key** has a **single value** that is of **format date-time** - [model 3.3.1](https://www.w3.org/TR/annotation-model/#lifecycle-information)",
  "description": "True when no Annotation Collection modified key present or when modified key has a single value that is of format date-time (Section 3.3.1)",
  "type": "object",
  "allOf": [
  { "$ref": "otherProperties.json#/definitions/modifiedValidIfPresent" }
  ]
}