RDF

semantic weltbild 2.0 wrote a short article about NEPOMUK-KDE, a project whose aim is to bring RDF's resource annotation to the KDE desktop environment. NEPOMUK-KDE is a sub-project of the Semantic-Desktop project Nepomuk which aims to provide a full implementation of the standards and APIs defined in Nepomuk on the KDE desktop. As a sub-project of Nepomuk the two main issues are the maintenance and intensive usage of metadata throughout the desktop and powerful peer-to-peer collaboration techiques. This is accomplished in part by ditching the simplistic, string-based tagging model in favor of using RDF. If only this was for GNOME. Check it out!

Danny Ayers has updated the RDF Review Vocabulary with a handful of new terms (suggested by ITerating and Revyu, two entities currently deploying this vocabulary), and also made it OWL DL-friendly. He's also set it up as a GRDDL-enabled HTML meta data profile for the hReview microformat. He says still has some debugging to do, and wants to put together a diagram showing the classes and properties.

Continue reading Updates Made to RDF Review Vocabulary

Ping the Semantic Web, the repository for RDF documents, has a page that lists every namespace they've come across as well as the number of references to each namespace. I've listed the top 20 namespaces and the number of references to each. It's interesting to see the sharp drop in references once you get past the top 5. Each of the links below point to a Zitgist Browser page for that namespace so that you can explore them further.

Continue reading Top 20 Namespaces via Ping the Semantic Web

ARC is a lightweight, SPARQL-enabled RDF system for mainstream Web projects. It is written in PHP and has been optimized for shared (or performance- or privilege-limited) Web environments. ARC facilitates the integration of RDF and SPARQL into PHP/MySQL frameworks.

ARC is a very well documented project, which I think is important for its success. Their documentation is clear, concise, and provides plenty of inline sample code to examine as you read and learn.

Continue reading ARC - RDF and SPARQL for PHP developers

Swoogle describes itself as being the search engine for the Semantic Web. Swoogle crawls the web looking for RDF documents. At this time Swoogle offers the these services:

• Search ontologies and instance data
• Search terms (URIs that have been defined as classes and properties)
• Provide metadata of Semantic Web documents
• Support browsing the Semantic Web
• Archive different versions of Semantic Web documents

Continue reading Swoogle - the Semantic Web search engine