A selector within SpecificResource may not exist

[jptmoore]

Currently the schema specifies that both source and selector are required in SpecificResource.

The Web Annotation Data Model says that there MAY be 0 or more selector relationships associated with a Specific Resource so the annotation body could be:

{ "@context": "http://www.w3.org/ns/anno.jsonld", "id": "http://example.org/anno18", "type": "Annotation", "body": { "type": "SpecificResource", "purpose": "tagging", "source": "http://example.org/city1" }, "target": { "id": "http://example.org/photo1", "type": "Image" } }

or as shown in the cookbook recipe https://iiif.io/api/cookbook/recipe/0022-linking-with-a-hotspot/manifest.json