Metadata

http://iiif.io/api/presentation/2.1/#metadata

The descriptive metadata that is usually provided is just enough data so that a user can know what they're looking at.

Semantic descriptive metadata can be linked as a seeAlso reference allowing different communities to expose their full metadata.

As the Presentation API is intended to present resources to users rather than for machines to understand the meaning of metadata, the metadata property contains a list of labels and values. So a simple piece of metadata would look like this:

{"label": "Author", "value": "Pierre Bayard"}

The display of this metadata could look something like this:

Author: Pierre Bayard

You see there's no way for a machine to know whether this is meant to be a http://schema.org/author or a property that means something else. Again, this metadata is meant only for display to users in label value pairs.

It is also possible to have the values in different languages:

{ "label": "Title", "value": [
    {"@value": "How to Talk About Books You Haven't Read", "@language": "en"},
    {"@value": "Comment parler des livres que l'on n'a pas lus?", "@language": "fr"}
  ]
}

In this case the client could decide to either use the English or French title based on configuring the client or on the locale of the browser.

Adding Metadata to a Manifest

Let's go back to our manifest. At the top level we'll add a metadata property with the following values:

As you update your manifest view the results in Universal Viewer and Mirador to see how the metadata displays.

Metadata Portion

The metadata portion ought to look something like this:

{
  "metadata": [
    { "label": "Creator", "value": "E. A. Seguy" },
    { "label": "Title", "value": [
        { "@value": "Butterflies", "@language": "en" },
        { "@value": "Papillons", "@language": "fr" }
      ]
    },
    { "label": "Created Date", "value": "circa 1920-1929" }
  ]
}

Full Manifest

full manifest with metadata

{
  "@context": "http://iiif.io/api/presentation/2/context.json",
  "@type": "sc:Manifest",
  "@id": "http://localhost:3000/manifest.json",
  "label": "Papillons",
  "description": "Four patterns inspired by butterflies.",
  "metadata": [
    { "label": "Creator", "value": "E. A. Seguy" },
    { "label": "Title", "value": [
        { "@value": "Butterflies", "@language": "en" },
        { "@value": "Papillons", "@language": "fr" }
      ]
    },
    { "label": "Created Date", "value": "circa 1920-1929" }
  ],
  "attribution": "Special Collections Research Center at NCSU Libraries",
  "logo": "http://localhost:3000/logo.jpg",
  "sequences": [
    {
      "@type": "sc:Sequence",
      "canvases": [
        {
          "@type": "sc:Canvas",
          "@id": "http://localhost:3000/segPap_022/canvas/1",
          "label": "22",
          "width": 6099,
          "height": 8599,
          "images": [
            {
              "@type": "oa:Annotation",
              "motivation": "sc:painting",
              "on": "http://localhost:3000/segPap_022/canvas/1",
              "resource": {
                "@type": "dctypes:Image",
                "@id": "https://iiif.lib.ncsu.edu/iiif/segPap_022/full/500,/0/default.jpg",

                "service": {
                  "@context":  "http://iiif.io/api/image/2/context.json",
                  "@id": "https://iiif.lib.ncsu.edu/iiif/segPap_022",
                  "profile": "http://iiif.io/api/image/2/level2.json"
                }
              }
            }
          ]
        }
      ]
    }
  ]
}