How to manipulate Json-ld? - semantic-web

Question

I've got this json-ld:
{ "#id": "http://www.example.com/john-doe",
"#type": "http://xmlns.com/foaf/0.1/Person",
"http://xmlns.com/foaf/0.1/name": "John Doe",
"http://xmlns.com/foaf/0.1/age": {
"#value": "42",
"#kind": "http://www.w3.org/2001/XMLSchema#nonNegativeInteger"},
"http://xmlns.com/foaf/0.1/knows" : [
{ "#id": "http://www.example.com/charlie-brown" },
{ "#id": "http://www.example.com/jane-doe" }
]
}
I have to write the context so that the below json-ld is valid.
{ "#context" : "context to write....",
"#id": "john-doe",
"#type": "person",
"name": "John Doe",
"age": "42",
"knows": ["charlie-brown", "jane-doe"]
}
I've write a solution but it's incomplete, and I can't figure out how to write a full solution, hope that someone can help me.

Answer 1

You have to use framing to get a result close to your requirements.
See this answer for a Java full code example, How to convert RDF to pretty nested JSON using java rdf4j .
See also this answer that contains some extra tipps in addition JSON-LD to normal JSON
Use this link for an example in json-ld playground. This is how your document with embedded #context would look like:
{
"#context": {
"name": {
"#id": "http://xmlns.com/foaf/0.1/name"
},
"age": {
"#id": "http://xmlns.com/foaf/0.1/age"
},
"knows": {
"#id": "http://xmlns.com/foaf/0.1/knows",
"#container": "#set"
}
},
"#id": "john-doe",
"#type": "person",
"name": "John Doe",
"age": "42",
"knows": [
"charlie-brown",
"jane-doe"
]
}
This is, how the frame would look like
{
"#context": {
"name": {
"#id": "http://xmlns.com/foaf/0.1/name"
},
"age": {
"#id": "http://xmlns.com/foaf/0.1/age"
},
"knows": {
"#id": "http://xmlns.com/foaf/0.1/knows",
"#container": "#set"
}
}
}
This will render to
{
"#context": {
"name": {
"#id": "http://xmlns.com/foaf/0.1/name"
},
"age": {
"#id": "http://xmlns.com/foaf/0.1/age"
},
"knows": {
"#id": "http://xmlns.com/foaf/0.1/knows",
"#container": "#set"
}
},
"#graph": [
{
"#id": "john-doe",
"#type": "https://json-ld.org/playground/person",
"age": "42",
"knows": [
"charlie-brown",
"jane-doe"
],
"name": "John Doe"
}
]
}