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"errorMessage": "Valid Annotation-level generated key not found. Annotation may have zero or exactly one generated key value.",
"title": "Implements Annotation-level **_generated_ key** which has a **single value** that is a **string of format date-time** - [model 3.3.1](https://www.w3.org/TR/annotation-model/#lifecycle-information)",
"description": "True when the Annotation implements exactly one generated key value (Section 3.3.1)",