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"errorMessage": "ERROR: Annotation has more than one value for canonical key or value for canonical key is not of format uri.",
"title": "If present the Annotation-level **_canonical_ key** has a **single value** that is a **string of format uri** - [model 3.3.7](https://www.w3.org/TR/annotation-model/#other-identities)",
"description": "True when no Annotation canonical key present or when value of canonical key is singular and of format uri (Section 3.3.7)",