Targeting a `choice` body using Content State -- is it possible?

[mathewjordan]

Hello,

We are experimenting with practical usage of Content State an have a UX conundrum where users can share to a Canvas, but not highlight which body resource is currently being viewed. In this example, a user would like to share a link to a non-default choice body on a painting Annotation. Is this possible using content state?

For example, in a content state link using this Manifest, we'd like to target the last choice entry. Note that when this link is clicked, the default choice body will show.

Currently this Content State resembles:

{
  "@context": "http://iiif.io/api/presentation/3/context.json",
  "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/state/-1548616880",
  "type": "Annotation",
  "motivation": ["contentState"],
  "target": {
    "type": "SpecificResource",
    "source": {
      "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/canvas/14",
      "type": "Canvas",
      "partOf": [{
        "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif",
        "type": "Manifest"
      }]
    },
    "selector": {
      "type": "FragmentSelector",
      "value": "xywh=389,227,1275,582"
    }
  },
  "body": [{
    "type": "TextualBody",
    "value": "metal fragment?\n <em>Note: This annotation was included as part of a user-authored shared link.</em>",
    "format": "text/plain"
  }]
}

The canvas in the example is below where the choice I want targeted is https://iiif.dc.library.northwestern.edu/iiif/3/1b1c1012-2a57-46a0-a42a-36de24d6033f/full/600,/0/default.jpg

{
  "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/canvas/14",
  "type": "Canvas",
  "height": 4536,
  "width": 3384,
  "label": {
    "none": [
      "page 6 recto"
    ]
  },
  "thumbnail": [
    {
      "id": "https://iiif.dc.library.northwestern.edu/iiif/3/092aeef8-e688-4865-b6f1-0fc65979682d/full/!300,300/0/default.jpg",
      "type": "Image",
      "format": "image/jpeg",
      "height": 300,
      "width": 300,
      "service": [
        {
          "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/092aeef8-e688-4865-b6f1-0fc65979682d",
          "@type": "ImageService2",
          "profile": "http://iiif.io/api/image/2/level2.json"
        }
      ]
    }
  ],
  "items": [
    {
      "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/canvas/14/annotation-page",
      "type": "AnnotationPage",
      "items": [
        {
          "id": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/canvas/14/annotation/0",
          "type": "Annotation",
          "motivation": "painting",
          "target": "https://api.dc.library.northwestern.edu/api/v2/works/b8c3df72-0fd5-40ea-bb1c-088513e46c58?as=iiif/canvas/14",
          "body": {
            "type": "Choice",
            "items": [
              {
                "id": "https://iiif.dc.library.northwestern.edu/iiif/3/092aeef8-e688-4865-b6f1-0fc65979682d/full/600,/0/default.jpg",
                "type": "Image",
                "format": "image/tiff",
                "height": 4536,
                "width": 3384,
                "label": {
                  "en": [
                    "page 6 recto"
                  ]
                },
                "service": [
                  {
                    "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/092aeef8-e688-4865-b6f1-0fc65979682d",
                    "@type": "ImageService2",
                    "profile": "http://iiif.io/api/image/2/level2.json"
                  }
                ]
              },
              {
                "id": "https://iiif.dc.library.northwestern.edu/iiif/3/d106269e-959d-430e-8af5-d906e9149e76/full/600,/0/default.jpg",
                "type": "Image",
                "format": "image/jpeg",
                "height": 1080,
                "width": 1920,
                "label": {
                  "en": [
                    "page 6, recto [Visible light]"
                  ]
                },
                "service": [
                  {
                    "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/d106269e-959d-430e-8af5-d906e9149e76",
                    "@type": "ImageService2",
                    "profile": "http://iiif.io/api/image/2/level2.json"
                  }
                ]
              },
              {
                "id": "https://iiif.dc.library.northwestern.edu/iiif/3/3f4de95f-da8a-4392-8258-9eb695f6fe52/full/600,/0/default.jpg",
                "type": "Image",
                "format": "image/jpeg",
                "height": 1080,
                "width": 1920,
                "label": {
                  "en": [
                    "page 6, recto [Visible light]"
                  ]
                },
                "service": [
                  {
                    "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/3f4de95f-da8a-4392-8258-9eb695f6fe52",
                    "@type": "ImageService2",
                    "profile": "http://iiif.io/api/image/2/level2.json"
                  }
                ]
              },
              {
                "id": "https://iiif.dc.library.northwestern.edu/iiif/3/f6e6da09-e67b-462a-b677-0e729ee20428/full/600,/0/default.jpg",
                "type": "Image",
                "format": "image/jpeg",
                "height": 1080,
                "width": 1920,
                "label": {
                  "en": [
                    "page 6, recto [Transmitted visible light] "
                  ]
                },
                "service": [
                  {
                    "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/f6e6da09-e67b-462a-b677-0e729ee20428",
                    "@type": "ImageService2",
                    "profile": "http://iiif.io/api/image/2/level2.json"
                  }
                ]
              },
              {
                "id": "https://iiif.dc.library.northwestern.edu/iiif/3/1b1c1012-2a57-46a0-a42a-36de24d6033f/full/600,/0/default.jpg",
                "type": "Image",
                "format": "image/jpeg",
                "height": 1080,
                "width": 1920,
                "label": {
                  "en": [
                    "page 6, recto [Transmitted Infrared light]"
                  ]
                },
                "service": [
                  {
                    "@id": "https://iiif.dc.library.northwestern.edu/iiif/3/1b1c1012-2a57-46a0-a42a-36de24d6033f",
                    "@type": "ImageService2",
                    "profile": "http://iiif.io/api/image/2/level2.json"
                  }
                ]
              }
            ]
          }
        }
      ]
    }
  ]
}

[kirschbombe]

I have a similar use case (targeting an item in a Choice using Content State) -- from what I understand it's not currently possible since the Choice doesn't have an id. This should be possible in presi 4 where id is allowed on a Choice.