PUBLIC MARKS with tags rdf & "semantic web"

this document defines an API for extracting structurated information from web pages, using the RDFa formalism.

A step-by-step guide which covers all the required steps before publishing data on the Web in a semantic way

EasyRdf is a PHP library designed to make it easy to consume and produce RDF. It was designed for use in mixed teams of experienced and inexperienced RDF developers. It is written in Object Oriented PHP.

A newly published RDFa validator.

jOWL is a jQuery plugin for navigating and visualising OWL-RDFS documents.

Exposes RDF based Linked Data Sources associated with Web Pages.

This paper presents an initiative to use RDF in actual projects - as opposed to mere demonstration efforts. The immediate background was the modeling of a large and rather amorphous enterprise architecture (EA).

Easy RDF and SPARQL for LAMP systems

Sindice, indexing millions of RDF documents

The Resource Description Framework RDF allows the users to describe Web documents and resources from the real world—people, organisations, things—in a computer-processable way. Publishing such descriptions on the Web creates the Semantic Web. URIs (Uniform Resource Identifiers) are very important, forming the link between RDF and the Web. This document presents guidelines for their effective use. It discusses two strategies, called 303 URIs and hash URIs. It gives pointers to several Web sites that use these solutions, and briefly discusses why several other proposals have problems.

RDF/OWL wikipedia exports by the wikipedia foundation.

Semantic MediaWiki (SMW) is an extension of MediaWiki – the wiki-system powering Wikipedia – with semantic technology, thus turning it into a semantic wiki. While articles in MediaWiki are just plain texts, SMW allows users to add structured data, comparable to the data one would usually store in a database. SMW uses the fact that such data is already contained in many articles: users just need to "mark" the according places so that the system can extract the relevant data without "understanding" the rest of the text. With this information, SMW can help to search, organise, browse, evaluate, and share the wiki's content. This wiki (the one you're just using) is usually running on the most recent version of the Semantic MediaWiki extensions, and thus also serves as a demonstration for the system. Semantic MediaWiki is used on many other sites and has also been featured in the press.

The DBpedia community uses a flexible and extensible framework to extract different kinds of structured information from Wikipedia. The DBpedia information extraction framework is written using PHP 5. The framework is available from the DBpedia SVN (GNU GPL License). This pages describes the DBpedia information extraction framework. The framework consists of the interfaces: Destination, Extractor, Page Collection and RDFnode, plus the essential classes Extraction Group, Extraction Job, Extraction Manager, Extraction Result and RDFtriple.

There is already a lot of structured data accessible on the Web through Web 2.0 APIs such as the eBay, Amazon, Yahoo, and Google Base APIs. Compared to these APIs, Linked Data has the advantage of providing a single, standardized access mechanism instead of relying on diverse interfaces and result formats.

Stuff in, triples out

dbpedia.org is a community effort to extract structured information from Wikipedia and to make this information available on the Web. dbpedia allows you to ask sophisticated queries against Wikipedia and to link other datasets on the Web to Wikipedia data.