jsonld-stream

This is a draft specification for building semantically interoperable javascript object/document streams.

Spec

A JSON-LD stream is a stream that emits javascript objects conformant to the JSON-LD specification, except that these objects do not include a @context object.

In the stream, objects that only contain an @context property may be given to denote the context for all objects in the stream. The programmer must make sure that a @context written in after objects have already been emitted, still work for all previously emitted objects.

Use in document stores (such as MongoDB)

Each collection should contain one @context document which can be used to convert all objects in the collection to RDF.

The root @id of the object should be used as the internal identifier of the document (E.g., in MongoDB @id becomes _id)

Serialize to files

When serialized to a file, each stream element must be stringified on one line. Each object in a file is delimited by a newline (\n).

Javascript library

This repository also contains a javascript library to work with jsonld-streams.

npm install jsonld-stream --save

It defines a couple of transformer classes which can be used as follows:

var jsonldstream = require('jsonld-stream');
fs.createReadStream('./test/data/connections.jsonldstream', {encoding : 'utf8'})
  .pipe(new jsonldstream.Deserializer())
  .pipe(new jsonldstream.JSONLDStreamToTriples())
  .pipe(new jsonldstream.TriplesToJSONLDStream())
  .pipe(new jsonldstream.Serializer());