Georeference Extension

[thehabes]

This PR should always be in draft until it is ready for review by TRC. It exists to review the georeferencing work and trigger the preview build.

[thehabes]

Thanks @kirschbombe and @mikeapp.

The ImageAPISelector context URL is https://iiif.io/api/annex/openannotation/context.json. This is for v2, but there is a branch for v3 that I need to finish up (the URL will likely be https://iiif.io/api/registry/webannotation/context.json)

Ok, looks good! I even did a test and updated the context I am testing with to be

"ImageApiSelector":{
        "@id":"iiif_selectors:ImageApiSelector",
        "@context": "https://iiif.io/api/annex/openannotation/context.json"
}

This works expected, and I no longer have to embed the terms directly. It is processes as

"http://www.w3.org/ns/oa#hasSelector": {
      "@type": "http://iiif.io/api/registry/selectors#ImageApiSelector",
      "http://iiif.io/api/image/2#regionValue": {
        "@type": "http://www.w3.org/2001/XMLSchema#string",
        "@value": "810,900,260,370"
      },
      "http://iiif.io/api/image/2#sizeValue": {
        "@type": "http://www.w3.org/2001/XMLSchema#string",
        "@value": "5965,2514"
      }
}

I will test the version 3 one as well when it is available. Good job, thank you. We can simplify ImageApiSelector in the georeference extension context.json even further like shown above when https://iiif.io/api/registry/webannotation/context.json is ready.

[zimeon]

IMO, there is no need for another round of +1's for this date change