Easy RDF and SPARQL for LAMP systems - ARC RDF Classes for PHP. Open Anzo - semantic middleware. HyperTwitter Start Page. 4store - Scalable RDF storage. Potential RDF use cases for Drupal | groups.drupal.org. Following up on my previous post introducing the in-progress RDF API for Drupal 6.x, I'm going to be, bit by bit, posting some of the materials that I've earlier put together internally for the project this is being developed for. Development of this project is supported through M.C. Dean and MakaluMedia on behalf of their clients.
First, some requisite background. Our use cases for RDF evolved out of several years of building a communications and collaboration platform serving the needs of an international community of intergovernmental agencies and organizations. The project as well as the potential applications described below reflect Ivan's and Chris's ideas and vision. Development of many well-known Drupal modules has been funded through this project while tackling these challenges; examples include OpenID, OpenSearch, LDAP provisioning, Timeline and Boost. Generic metadata storage Many (most?) Faceted browsing Utilizing open, linked data From modules to widgets RDF export functionality.
Microformats introduction to content and user experience. An Introduction to RDF and the Jena RDF API. Search RDF data with SPARQL. SPARQL and the Jena Toolkit open up the semantic Web Philip McCarthyPublished on May 10, 2005 The Resource Description Framework, or RDF, enables data to be decentralized and distributed. RDF models can be merged together easily, and serialized RDF can be simply exchanged over HTTP. Applications can be loosely coupled to multiple RDF data sources over the Web. At PlanetRDF.com, for example, we syndicate weblogs from authors who provide their content as RDF in a RSS 1.0 feed.
The URLs of the authors' feeds are themselves held in an RDF graph, called bloggers.rdf. But how can you find and manipulate the data you need within RDF graphs? This article assumes that you have a working knowledge of RDF, and are familiar with RDF vocabularies such as Dublin Core, FOAF, and RSS 1.0. Anatomy of a simple SPARQL query Let's start by looking at PlanetRDF's bloggers.rdf model. Figure 1. View image at full size Now let's look at a very simple SPARQL query over the bloggers model. Listing 1. Listing 2. ARQ - SPARQL Tutorial.