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Easy RDF and SPARQL for LAMP systems

ARC is a flexible RDF system for semantic web and PHP practitioners. It's free, open-source, easy to use, and runs in most web server environments (it's PHP 5.3 E_STRICT-compliant).

Features

ConNeg-capable Web Reader

Support for proxies, redirects, and Content Negotiation

Various parsers

RDF/XML, N-Triples, Turtle, SPARQL + SPOG, Legacy XML, HTML tag soup, RSS 2.0, Google Social Graph API JSON

Serializers

N-Triples, RDF/JSON, RDF/XML, Turtle, SPOG dumps

2 internal structures

resource-centric processing, statement-centric processing

RDF Storage (using MySQL)

SPARQL SELECT, ASK, DESCRIBE, CONSTRUCT, + aggregates, LOAD, INSERT, and DELETE

SPARQL Endpoint Class

Set up a compliant SPARQL endpoint with 3 lines of code

SemHTML RDF extractors

DC, eRDF, microformats, OpenID, RDFa

RemoteStore Class

Query remote SPARQL endpoints as if they were local stores (results are returned as native PHP arrays)

Turtle templating

Generate dynamic graphs

Plugins

Extend ARC with your own, custom extensions

Triggers

Register event handlers for selected SPARQL Query types

SPARQLScript

SPARQL-based scripting and output templating

License

ARC2 is available under 2 licenses: The W3C Software License or the GPL.

Mailing list

arc-dev (formerly at arc.semsol.org, now maintained by Stéphane Corlosquet)

Core Documentation

• Getting Started with ARC2
• Internal Structures
• Parsing RDF Formats
• Using ARC's RDF Store
• SPARQL Endpoint Setup
• Serializing ARC structures
• Extracting RDF from HTML
• Remote Stores and Endpoints
• Resource Helper Class
• HTTP Reader
• SPARQL+
• SPARQL Extension Functions

Advanced Features and Components

• Stand-alone SPARQL Parsing
• SPARQLScript
• Turtle Templates

Plugins

• How to write plugins for ARC2
• List of Plugins

Triggers

• How to write triggers for ARC

See also

• ARC2 Starter Pack
• Graphite RDF Library for PHP
• Moriarty
• EasyRDF

History

ARC started in 2004 as a lightweight RDF system for parsing and serializing RDF/XML files. It later evolved into a more complete framework with storage and query functionality. By 2011, ARC2 had become one of the most-installed RDF libraries. Nevertheless, active code development had to be discontinued due to lack of funds and the inability to efficiently implement the ever-growing stack of RDF specifications.

The sources continue to be available to the community through github.