Planning a Semantic Web site

junio 30, 2009

Rob Crowther (, Web developer, Freelance

Summary: The Semantic Web brings with it the opportunities for users to get smarter search results, and for site owners to get more targeted traffic as users find what they really want. But these benefits don’t just magically appear. This article leads you through the aspects of both information architecture and general infrastructure you need in place to truly take advantage of this burgeoning opportunity.

This article discusses what you need to know to make your Web site part of the Semantic Web. It starts with a discussion of the problems the Semantic Web tries to solve and then moves to the technologies involved, such as Resource Description Framework (RDF), Web Ontology Language (OWL), and SPARQL Protocol and RDF Query Language (SPARQL). You’ll see how the Semantic Web is layered on top of the existing Web. It then covers some issues that you want to know about when you plan a new Web site and also gives specific examples of how to use technologies like RDFa and Microformats to enable your existing Web site to become a part of the Semantic Web.



mayo 19, 2009

RDF Gravity is a tool for visualising RDF/OWL Graphs/ ontologies.

Its main features are:

* Graph Visualization

* Global and Local Filters (enabling specific views on a graph)

* Full text Search

* Generating views from RDQL Queries

* Visualising multiple RDF files

RDF Gravity is implemented by using the JUNG Graph API and Jena semantic web toolkit.


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Aperture Framework

mayo 15, 2009

Java (programming language)
Image via Wikipedia


a Java framework for getting data and metadata

Project name

From Merriam-Webster Online:

Main Entry: ap·er·ture (sounds like this)

Pronunciation: ‘ap-&(r)-“chur, -ch&r, -“tyur, -“tur

Function: noun

Etymology: Middle English, from Latin apertura, from apertus, past participle of aperire to open

1. an opening or open space : HOLE

2. a : the opening in a photographic lens that admits the light

b : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument

c : the diameter of the objective lens or mirror of a telescope

Sourceforge project

desdeAperture Framework.

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Semantic Web Server – URIQA

mayo 9, 2009

Semantic Web Server – URIQA

Logo for Semantic Web Server - URIQA


The Nokia Semantic Web Server is an RDF based application suite for metadata-driven web publishing and knowledge management. It is a central component of the Forum Nokia website, the Nokia Research Center website, and the Nokia Open Source website. It also serves as Nokia’s reference implementation of URIQA, the URI Query Agent model.

The Nokia Semantic Web Server suite is comprised of a number of modular semantic web services:

/uriqa? – a URIQA query portal, with rule-based inference functionality.

/new? – a query portal for obtaining information about recently published or updated resources, provided as RSS 1.0 or as RDF Facets; also with rule-based inference functionality.

/id? – a resource identifier generator, employing UUIDs and providing PURL functionality.

/query? – a metadata and free-text query portal, providing output results as RSS 1.0 feeds; with both metadata driven and crawler based indexing agents.

/search? – a human friendly search UI; which integrates with any conformant /query? portal.

/editor? – a web form based, ontology driven metadata editor with validation and user authentication & access control; which integrates with any conformant /uriqa? portal.

The core of these web services are provided as open source, and while most can be used “out of the box”, some require a moderate amount of configuration and customization depending on the requirements and constraints of the particular solution.


The Nokia Semantic Web Server code is released under the NOKOS version 1.0a .


SWS-URIQA is available on the download page on Sourceforge

Semantic Web Server – URIQA.

Patrick Stickler — contact

ieml. Pierre Levy

abril 7, 2009

IEML: Computational semantics in the service of collective intelligence

The vision behind the IEML (Information Economy MetaLanguage) initiative.

By Prof. Pierre Lévy
Fellow of the Royal Society (Academy of Sciences) of Canada
Director of the Canada Research Chair in Collective Intelligence
University of Ottawa

Text translated by Michele Healy

The semantic interoperability problem

The universe of communication opened up to us by the interconnection of digital data and automatic manipulators of symbols – in other words, cyberspace – henceforth constitutes the virtual memory of collective human intelligence. Yet, at the symbolic level, important obstacles hinder digital memory from working fully in the service of an optimal management of knowledge. These obstacles can be decomposed into two interdependent sub-groups.

The first one concerns the multiplicity and the incompatibility of symbolic systems:


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Semantic Web Use Cases and Case Studies: Twine

abril 6, 2009

Image representing Twine as depicted in CrunchBase
Image via CrunchBase

Jim Wissner Twine and Nova Spivack, Twine, USA

April 2009


Twine helps people track, discover, and share content around topics they are interested in.

Twine is built on a semantic applications platform that combines W3C standards for RDF and OWL with natural-language processing, statistical analysis and graph analysis capabilities.

Twine is developed by Radar Networks, headquartered in San Francisco. Before developing Twine, Radar Networks had worked on the CALO Cognitive agent That Learns and Organizes project, a distributed research program focused on next-generation semantically-aware machine learning applications. The Twine product was initially shown in late 2007 and early 2008 and became publicly available in October 2008.

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Presentation Files: Web 2.0 Expo San Francisco 2009 – Co-produced by TechWeb & O’Reilly Conferences, March 31 – April 03, 2009, San Francisco, CA

abril 3, 2009

Speaker Presentation Files: Web 2.0 Expo SF 2009 Slides for Download and Plenary Video

Presentation files will be made available after the session has concluded and the speaker has given us the files. Check back if you don’t see the file you’re looking for—it might be available later! (However, please note some speakers choose not to share their presentations.)

desdePresentation Files: Web 2.0 Expo San Francisco 2009 – Co-produced by TechWeb & O’Reilly Conferences, March 31 – April 03, 2009, San Francisco, CA.