Per https://iiif.io/api/presentation/3.0/#53-canvas, an AnnotationPage inside the items or annotations property can be referenced/external, but this is currently not validated properly by the schema, as it would be possible to add an external AnnotationPage that contained items
I think that to fix this we need an AnnotationPageRef in line with the other new reference types.
Per https://iiif.io/api/presentation/3.0/#53-canvas, an AnnotationPage inside the
itemsorannotationsproperty can be referenced/external, but this is currently not validated properly by the schema, as it would be possible to add an external AnnotationPage that containeditemsI think that to fix this we need an
AnnotationPageRefin line with the other new reference types.