JSON-LD to normal JSON - json

Question

I'm trying to insert a JSON-LD file into my CouchDB. The only problem I have is that when I insert my JSON-LD file, the resulting CouchDB is meaningless because the IDs aren't linked together.
An example of what my JSON-LD file looks like:
"contributor": [
{
"#id": "_:N6e57c55b35b74782ada714fdc6d66bf1"
},
{
"#id": "_:N810e115dfb3348579a7b826a7548095b"
}
And another part:
{
"#id": "_:N6e57c55b35b74782ada714fdc6d66bf1",
"#type": "Person",
"label": "Isely, Duane, 1918-"
},
{
"#id": "_:N810e115dfb3348579a7b826a7548095b",
"#type": "Person",
"label": "Cronquist, Arthur"
}
Now the IDs in "contributor" are linking to the two fields of the second part, which is describing person. I would like to know how to link them (the correct way), so I would get something like this:
"contributor": [
{
"#type": "Person",
"label": "Isely, Duane, 1918-"
},
{
"#type": "Person",
"label": "Cronquist, Arthur"
}

Answer 1

You could use a JSON-LD processor to (re)create nicer JSON for your DB. A good possibility to prescribe the structure of JSON-LD documents is to define a frame.
Quote from spec:
JSON-LD Framing allows developers to query by example and force a specific tree layout to a JSON-LD document.
Example:
Assuming your document looks like
{
"#context": {
"contributor": {
"#type": "#id",
"#id": "http://purl.org/dc/terms/contributor",
"#container": "#list"
},
"label": {
"#id": "http://www.w3.org/2004/02/skos/core#prefLabel"
}
},
"#graph": [
{
"#type": "MainResource",
"#id": "_:foo",
"contributor": [
{
"#id": "_:N6e57c55b35b74782ada714fdc6d66bf1"
},
{
"#id": "_:N810e115dfb3348579a7b826a7548095b"
}
]
},
{
"#id": "_:N6e57c55b35b74782ada714fdc6d66bf1",
"#type": "Person",
"label": "Isely, Duane, 1918-"
},
{
"#id": "_:N810e115dfb3348579a7b826a7548095b",
"#type": "Person",
"label": "Cronquist, Arthur"
}
]
}
Add a JSON-LD Frame like
{
"#context": {
"contributor": {
"#type": "#id",
"#id": "http://purl.org/dc/terms/contributor",
"#container": "#list"
},
"label": {
"#id": "http://www.w3.org/2004/02/skos/core#prefLabel"
}
},
"#type": "MainResource",
"#embed": "always"
}
Throw it to a JSON-LD processor of your choice and you will get something like
{
"#context": {
"contributor": {
"#type": "#id",
"#id": "http://purl.org/dc/terms/contributor",
"#container": "#list"
},
"label": {
"#id": "http://www.w3.org/2004/02/skos/core#prefLabel"
}
},
"#graph": [
{
"#id": "_:b0",
"#type": "http://json-ld.org/playground/MainResource",
"contributor": [
{
"#id": "_:b1",
"#type": "http://json-ld.org/playground/Person",
"label": "Isely, Duane, 1918-"
},
{
"#id": "_:b2",
"#type": "http://json-ld.org/playground/Person",
"label": "Cronquist, Arthur"
}
]
}
]
}
Here is the complete example in json-ld.org/playground
Unfortunately framing is not equaly well supported. So the result depends on the JSON-LD processor you're using.
You can elaborate further by removing "#" signs from your data. Simply add the following to your context:
"type" : "#type",
"id" :"#id"
Also, you can add shortenings for types to your context document
"MainResource": "http://json-ld.org/playground/MainResource"
See example in json-ld.org/playground
For full code java example with rdf4j look here: How to convert RDF to pretty nested JSON using java rdf4j .