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Web Developer Resource Index: RDF

The Resource Description Framework is a family of XML languages used to describe metadata and the relationships between resources on the WWW. Resources in RDF are defined in terms of a URI. The RDF model is based on a subject, predicate, object expression (triple) about these relationships. The subject of such an expression is the resource, the object is the metadata regarding that resource, and the predicate is the relationship between the two.

This application is full of examples, consider the first resource listed in this category. Two obvious properties of this resource are the title and author. In English, we would state:

The title of http://www.w3.org/RDF/ is Resource Description Framework.
The author of http://www.w3.org/RDF/ is Eric Miller.

If we look closer at the second example, the RDF triple consists of:

1. a subject that is the URI http://www.w3.org/RDF/
2. an object that is the author Eric Miller
3. a predicate which is the assertion “the author of”

In the RDF dialect of XML these expressions might be encoded like this:

Note: the use of "dc.creator" and its namespace (dc). This refers to applying DCMI in these expressions. “Creator” is a broader (and more accurate) term for what I'm using here as author. Also note that the author has a property as well, in most cases a URI to biographical information. This is the essence of the Semantic Web, imagine visiting a search engine and asking a question like “show me the biography for the author who wrote this document.” I certainly wish it worked that way now—creating this database is a lot of work!

Visit Expressing Simple Dublin Core in RDF/XML for more information.

Updated: Wednesday, October 29th, 2008 @ 1:53 AM EDT

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Resources

• 1.Resource Description Framework

  RDF integrates a variety of applications from library catalogs and world-wide directories to syndication and aggregation of news, software, and content to personal collections of music, photos, and events using XML as an interchange syntax. [23]

  ★★★★☆
  URI:http://www.w3.org/RDF/
  Author:
  Eric Miller
  [3]
  Reviewed:Sunday, April 3rd, 2005 @ 4:17 PM EDT
  by:
  Douglas Clifton
  
  Resource Description Framework rdfsemantic webw3cxml
   

• 2.Redland

  The Redland application framework is a set of open-source software libraries written in C, with language bindings that include Perl, PHP, Python, Ruby and more. Other packages that form Redland include Raptor (RDF parser) and Rasqal (RDF query library). [1652]

  ★★★★☆
  URI:http://librdf.org/
  Author:
  Dave Beckett
  [3]
  Reviewed:Wednesday, February 22nd, 2006 @ 8:46 PM EST
  by:
  Douglas Clifton
  
  Redland apiframeworkopen-sourceperlphppythonrdfrubysemantic web
   

• 3.rdf:about

  Geared toward those familiar with XML and programming, a very well-written Quick Intro to RDF is followed by a more in-depth introduction. Both are presented in several formats for you to choose from. Also included are references and a resources section. [1577]

  ★★★★☆
  URI:http://aboutrdf.net/
  Author:
  Joshua Tauberer
  [1]
  Reviewed:Saturday, December 24th, 2005 @ 12:06 AM EST
  by:
  Douglas Clifton
  
  rdf:about programmingrdfsemantic webxml
   

• 4.RDF Validation Service

  Another powerful tool from our friends at the W3C. Not only validates your RDF documents, also displays your triples in table and/or graph representation (including a zoomable view if you have the correct Java plug-in), and other advance features. [1278]

  ★★★★☆
  URI:http://www.w3.org/RDF/Validator/
  Author:
  Eric Prud'hommeaux
  [2]
  Reviewed:Thursday, June 9th, 2005 @ 1:29 PM EDT
  by:
  Douglas Clifton
  
  RDF Validation Service rdfsemantic webvalidatorw3c
   

• 5.RAP: RDF API for PHP

  A Semantic Web toolkit for PHP developers. Offers one API for manipulating RDF graphs as a set of statements, and another for manipulating RDF graphs as a set of resources. Supports in-memory or database model storage and the RDQL query language. [1268]

  ★★★★☆
  URI:http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/
  Author:
  Chris Bizer
  [1]
  Reviewed:Sunday, June 5th, 2005 @ 8:32 PM EDT
  by:
  Douglas Clifton
  
  RAP: RDF API for PHP apideveloperphprdfsemantic web
   

• 6.SPARQL Query Language for RDF

  What XQuery is to XML, SPARQL is to RDF: it is designed to access data from a source. In the context of RDF however, it becomes most powerful when extracting relationships across the network, and is thus a tool designed for the Semantic Web. [1236]

  ★★★★☆
  URI:http://www.w3.org/TR/rdf-sparql-query/
  Author:
  Eric Prud'hommeaux
  [2]
  Reviewed:Tuesday, May 24th, 2005 @ 9:02 PM EDT
  by:
  Douglas Clifton
  
  SPARQL Query Language for RDF rdfsemantic websparqlw3cxmlxquery
   

• 7.Joe Lambda's Home page

  An example home page for "Joe Lambda", with the purpose of demonstrating how to mix several RDF vocabularies in XHTML using a technique involving XSLT. Includes examples of FOAF, Creative Commons License, Dublin Core, GeoURL and RSS 1.0. [1019]

  ★★★★☆
  URI:http://www.w3.org/2004/lambda/Sites/
  Author:
  Dominique Hazaël-Massieux
  [5]
  Reviewed:Tuesday, April 19th, 2005 @ 7:20 PM EDT
  by:
  Douglas Clifton
  
  Joe Lambda's Home page copyrightcreative commonsdublin corefoafgeourlrdfrssw3cxhtmlxslt
   

• 8.RDF Primer

  RDF is intended for situations in which information needs to be processed by applications, rather than being only displayed to people. RDF provides a common framework for expressing this information so it can be exchanged between applications. [274]

  ★★★★☆
  URI:http://www.w3.org/TR/rdf-primer/
  Author:
  Frank Manola
  [1]
  Reviewed:Monday, April 18th, 2005 @ 3:00 PM EDT
  by:
  Douglas Clifton
  
  RDF Primer rdfw3c
   

• 9.RDF Schemas Directory

  A repository for RDF schemas expressed in the RDFs, OWL and DAML+OIL schema languages. [26]

  ★★★★☆
  URI:http://www.schemaweb.info/
  Author:
  Victor Lindesay
  [1]
  Reviewed:Sunday, April 3rd, 2005 @ 5:29 PM EDT
  by:
  Douglas Clifton
  
  RDF Schemas Directory directoryowlrdfschema
   

• 10.RDF Resources

  Links to research, discussions and implementations of RDF including parsers, relational database models, APIs and other frameworks. [25]

  ★★★★☆
  URI:http://www-db.stanford.edu/~melnik/rdf/
  Author:
  Sergey Melnik
  [1]
  Reviewed:Sunday, April 3rd, 2005 @ 4:51 PM EDT
  by:
  Douglas Clifton
  
  RDF Resources databaserdf
   

• 11.RDF Resource Guide

  The Resource Description Framework is a standard for describing resources on the web. This guide contains links to many RDF resources including examples, documents, software, tools and projects that use it. [24]

  ★★★★☆
  URI:http://www.ilrt.bris.ac.uk/discovery/rdf/resources/
  Author:
  Dave Beckett
  [3]
  Reviewed:Sunday, April 3rd, 2005 @ 4:28 PM EDT
  by:
  Douglas Clifton
  
  RDF Resource Guide directoryrdfsoftware
   

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Last updated: Wednesday, October 29th, 2008 @ 1:53 AM EDT [2008-10-29T05:53:45Z]