Compacting JSON-LD property w/ two different @types?

Question

I'm attempting to compact at JSON-LD document, see below (we're using URNs but the same issue occurs with URLs). I want "org:example:property:schema;2"to be compacted to schema in both of the usages below, and the nested objects of the schema property to also be compacted reasonably. Sadly, this seems so far impossible.

[
  {
    "@id": "org:example:ExampleThing",
    "org:example:property:contents;2": [
          {
        "@type": "org:example:class:Property;2",
        "org:example:property:schema;2": {
          "@id": "org:example:instance:Schema:integer;2"
        }
      }
    ]
  },
  {
    "@id": "org:example:ExampleThing2",
    "org:example:property:contents;2": [
      {
        "@type": "org:example:class:Property;2",
        "org:example:property:schema;2": {
            "@type": "org:example:class:Enum;2",
            "org:example:property:valueSchema;2": {
                "@id": "org:example:instance:Schema:string;2"
            }
        }
      }
    ]
  }
]

What I would like to get out is the following:

[
    {
      "@id": "org:example:ExampleThing",
      "contents": {
        "@type": "Property",
        "schema": {
          "@id": "integer"
        }
      }
    },
    {
      "@id": "org:example:ExampleThing2",
      "contents": {
        "@type": "Property",
        "schema": {
          "@type": "Enum",
          "valueSchema": "string"
        }
      }
    }
  ]

The closest I've gotten is the following context. In it, however, org:example:instance:Schema:integer;2 is not compacted as required. Adding "@type": "@vocab" to the schema definition resolves this for ExampleThing, but then the schema term does not match the usage of the property in ExampleThing2, so it is not compacted there instead.

{
  "Property": { "@id": "org:example:class:Property;2" },
  "Enum": { "@id": "org:example:class:Enum;2" },
  "contents": { "@id": "org:example:property:contents;2" },
  "schema": { "@id": "org:example:property:schema;2" },
  "valueSchema": {
      "@id": "org:example:property:valueSchema;2",
      "@type": "@vocab"
  },
  "integer": { "@id": "org:example:instance:Schema:integer;2" },
  "string": { "@id": "org:example:instance:Schema:string;2" }
}

Gregg Kellogg · Accepted Answer · 2020-08-28 19:19:15Z

0

What you have is pretty close to what you want. You can check out the playground link here.

The main issue is that the "org:example:instance:Schema:integer;2" @id value can't be compacted any further, as values of @id are treated as IRIs relative to the document location, or @base. You could add an @base declaration to the context, which could get you somewhat closer. You could do better using scoped contexts, and use a different @base in the context scoped under either Property or schema.

Without doing that, this is what the compaction result looks like:

{
  "@context": {
    "Property": {"@id": "org:example:class:Property;2"},
    "Enum": {"@id": "org:example:class:Enum;2"},
    "contents": {"@id": "org:example:property:contents;2"},
    "schema": {"@id": "org:example:property:schema;2"},
    "valueSchema": {
      "@id": "org:example:property:valueSchema;2",
      "@type": "@vocab"
    },
    "integer": {"@id": "org:example:instance:Schema:integer;2"},
    "string": {"@id": "org:example:instance:Schema:string;2"}
  },
  "@graph": [
    {
      "@id": "org:example:ExampleThing",
      "contents": {
        "@type": "Property",
        "schema": {
          "@id": "org:example:instance:Schema:integer;2"
        }
      }
    },
    {
      "@id": "org:example:ExampleThing2",
      "contents": {
        "@type": "Property",
        "schema": {
          "@type": "Enum",
          "valueSchema": "string"
        }
      }
    }
  ]
}

You can read more in the Shortening IRIs section of the spec.

answered Aug 28, 2020 at 19:19

Gregg Kellogg

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1 Comment

Karl Over a year ago

Thank you! It is unfortunate that I cannot achieve what I'd like to here, but I guess I'll have to make do.

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