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"errorMessage": "Nickname for Annotation Creator (Agent) not found. Agents should have exactly one nickname value.",
"title": "Implements Annotation-level creator (Agent) **_nickname_ key** with a **single value** that is a string - [model 3.2.2](https://www.w3.org/TR/annotation-model/#agents)",
"description": "True when exactly one nickname for Annotation Creator (Agent) is implemented (Section 3.3.2)",