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"errorMessage": "canonical key having a single string value of format uri not found. Annotation may have canonical key with exactly one value.",
"title": "Implements Annotation-level **_canonical_ key** which 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 the Annotation implements canonical key with with single string of format uri value (Section 3.3.7)",