JsonLD

JsonLD is a PSR-0, PSR-1, and PSR-2 compliant JSON-LD processor. It is extensively tested and passes the official JSON-LD test suite.

There's an online playground where you can evaluate the processor's basic functionality.

All the features of the official specification plus a few more are supported:

• expansion
• compaction
• flattening
• framing (supports value matching, deep-filtering, aggressive re-embedding, and named graphs)
• toRDF
• fromRDF
• node-based access (partially implemented)

Installation

The easiest way to use JsonLD is to integrate it as a dependency in your project's composer.json file:

{
    "require": {
        "ml/json-ld": "@dev"
    }
}

Installing is then a matter of running composer

php composer.phar install

... and including Composer's autoloader to your project

require('vendor/autoload.php');

Of course you can also download it as ZIP archive from Github.

Usage

The library supports the official JSON-LD API as well as a node-centric API (still a work in progress, see issue #15 for details).

All classes are extensively documented. Please have a look at the source code.

// Official JSON-LD API
$expanded = JsonLD::expand('document.jsonld');
$compacted = JsonLD::compact('document.jsonld', 'context.jsonld');
$framed = JsonLD::frame('document.jsonld', 'frame.jsonld');
$flattened = JsonLD::flatten('document.jsonld');
$quads = JsonLD::toRdf('document.jsonld');

// Output the expanded document (pretty print)
print JsonLD::toString($expanded, true);

// Serialize the quads as N-Quads
$nquads = new NQuads();
$serialized = $nquads->serialize($quads);
print $serialized;

// And parse them again to a JSON-LD document
$quads = $nquads->parse($serialized);
$document = JsonLD::fromRdf($quads);

print JsonLD::toString($document, true);

// Node-centric API
$doc = JsonLD::getDocument('document.jsonld');

// get the default graph
$graph = $doc->getGraph();

// get all nodes in the graph
$nodes = $graph->getNodes();

// retrieve a node by ID
$node = $graph->getNode('http://example.com/node1');

// get a property
$node->getProperty('http://example.com/vocab/name');

// add a new blank node to the graph
$newNode = $graph->createNode();

// link the new blank node to the existing node
$node->addPropertyValue('http://example.com/vocab/link', $newNode);

// even reverse properties are supported; this returns $newNode
$node->getReverseProperty('http://example.com/vocab/link');

// serialize the graph and convert it to a string
$serialized = JsonLD::toString($graph->toJsonLd());

Commercial Support

Commercial support is available on request.