A strawman example of encoding a Dublin Core Application Profile as JSON-LD context object.

context.json

{ 
  "@id": "http://example.com/app-profile.json",
  "@context": {
    "title": "http://purl.org/dc/terms/title",
    "description": "http://purl.org/dc/terms/description",
    "creator": "http://purl.org/dc/terms/creator"
  },
  "title": "JSON-LD Dublin Core Application Profile",
  "description": "This is an example of a Dublin Core Application Profile as a JSON-LD. The point is to demonstrate that a JSON-LD context document could contain metadata. If it is desirable to annotate the use of particular properties they could theoretically fit into @graph using existing or a new DCAP vocabulary, etc.",
  "creator": "http://twitter.com/edsu",
  "@graph": [
    ... add any details here about how particular properties are being used  ...
  ]
}
  
  

item.json

{
  "@context": "http://example.com/app-profile.json",
  "@id": "http://example.com/item/123",
  "title": "Awesome resource metadata",
  "description": "This is an item description that references the app profile using JSON-LD context.",
  ...
}