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Tools for linked data from DERI

From: Peristeras, Vassilios <vassilios.peristeras@deri.org>
Date: Tue, 3 Nov 2009 10:42:29 -0000
Message-ID: <6B017AD2AE2F6F489087FC986588136B08CCEB3D@EVS1.ac.nuigalway.ie>
To: "eGov IG" <public-egov-ig@w3.org>


I collected some information about work we do here at DERI (www.deri.ie <http://www.deri.ie/> ) and is related to linked data. 

 Don't hesitate to contact me if you need more information.


*Sindice* (http://sindice.com/) is the world-leading Web of Data indexer and search engine. It indexes all kind of structured data such as RDF/XML, RDFa, and microformats and offers additionally a set of APIs (http://sindice.com/developers/) that allow to use it from 3rd-party applications.


*Web Data Inspector* (http://sindice.com/developers/inspector) is a debugging and analytics tools that renders all kinds of structured data (RDFa, RDF/XML, etc.) as Sindice sees it, in diverse forms, including the schema level (vocabularies used) and a graph visualisation of the underlying RDF. 


*Sigma* (http://sig.ma/) is a Web of Data browser providing live Web views on the Web of Data. It is built on top of Sindice and uses additionally technologies from OKKAM (http://www.okkam.org/) and Yahoo! BOSS ( http://developer.yahoo.com/search/boss/). The user interface renders the structured data in a convenient way and additionally reports the origin of the data source so that a human can disambiguate information found on the open Web of Data. Sigma as well offers APIs and embeddable 'live widgets', that is if one of the sources updates its information, the widget is updated as well.


*Neologism* (http://neologism.deri.ie/) is a Web-based vocabulary editor based on Drupal. Its main goal is to dramatically reduce the time required to create, publish and modify vocabularies for the Web of Data. It produces RDF Schema-based vocabularies including HTML and RDF representations and provides a graphical visualisation of the so created vocabulary. Example instances run at http://rdfs.org/ns/ and http://imp.deri.ie/ontology/


* DERI contributed significantly to the Opensource CMS Drupal and modules therein to produce and consume linked open data. Particularly, the rdfcck (http://drupal.org/project/rdfcck) and evoc (http://drupal.org/project/evoc) modules allow to generate RDF and RDFa from any existing Drupal site, and map it to existing vocabularies on the Web. Additionally, modules for providing a SPARQL endpoint and for including external RDF data buy a SPARQL endpoint have been developed and are ready for use.


* XSPARQL (http://xsparql.deri.org <http://xsparql.deri.org/> ) With currently available tools and languages, translating between an existing XML format and RDF is a tedious and error-prone task. The importance of this problem is acknowledged by the W3C GRDDL working group who faces the issue of extracting RDF data out of existing HTML or XML files, as well as by the Web service community around SAWSDL, who need to perform lowering and lifting between RDF data from a semantic client and XML messages for a Web service. However, at the moment, both these groups rely solely on XSLT transformations between RDF/XML and the respective other XML format at hand. We propose a more natural approach for such transformations based on merging XQuery and SPARQL into the novel language XSPARQL. XSPARQL provides concise and intuitive solutions for mapping between XML and RDF in either direction, addressing both the use cases of GRDDL and SAWSDL. An implementation of a XSPARQL engine is available at sourceforge.


* The Linked Data Research Centre (LiDRC) (http://linkeddata.deri.ie/) is a research centre with the mission to bundle activities around linked data throughout DERI. In the LiDRC several research themes are covered (publishing linked data, discovery, applications, streamed linked data, linked government data) aiming at both research and development. Currently,

13 DERI researcher (http://linkeddata.deri.ie/people] work together with nine peer research groups (http://linkeddata.deri.ie/peers) (incl. Tim Berners-Lee's group at MIT, Jim Hendler at RPI, and Chris Bizer at Freie Universitšt Berlin) to address the challenges of publishing and consuming linked data. Additionally to the R&D work, the LiDRC offers linked data tutorials, as well as tools and libraries around linked data (http://linkeddata.deri.ie/services).



Received on Tuesday, 3 November 2009 10:43:06 UTC

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