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UKOLN is supported by: Semantic content management Consuming & producing RDF in Drupal Thom Bunting, Web Manager 12 July 2010, IWMW Sheffield

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Semantic CMS objectives <ul><li>By automatically including Resource Description Framework information (RDF / RDFa), content management systems can: </li></ul><ul><li>Improve search engine visibility of content </li></ul><ul><li>Reduce need for manual crafting of code </li></ul><ul><li>Strengthen RDF / RDFa consistency </li></ul><ul><li>Extend semantic data consumption & production </li></ul><ul><li>Integrate websites into ‘giant global graph’ http://www.slideshare.net/scorlosquet/how-to-build-linked-data-sites-with-drupal-7-and-rdfa </li></ul>

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Semantic Drupal: origins <ul><li>DrupalCon Boston 2008 keynote confirms importance of RDF in Drupal http://openspring.net/sites/openspring.net/files/corl-etal-2009iswc.pdf </li></ul><ul><li>Dries Buytaert ‘video from the future’ shows way forward via RDF http://video.google.com/videoplay?docid=8487255297768440860# </li></ul><ul><li>2 years active planning & development http://www.openspring.net/zfeed </li></ul>

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Semantic Drupal: in context <ul><li>Google: Rich Snippets http://www.google.com/webmasters/tools/richsnippets </li></ul><ul><li>Yahoo: SearchMonkey http://developer.yahoo.com/searchmonkey/smguide/faq.html </li></ul><ul><li>Facebook: OpenGraph http://www.openspring.net/blog/2010/05/26/the-open-graph-protocol-and-drupal </li></ul><ul><li>BestBuy ‘poster child’ http://www.readwriteweb.com/archives/how_best_buy_is_using_the_semantic_web.php </li></ul>

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Semantic Drupal: consuming <ul><li>Drupal supports retrieval of RDF from remote sites </li></ul><ul><li>Drupal facilitates synchronisation of ‘master’ data (FOAF files, DBpedia, etc) </li></ul><ul><li>Drupal to enable periodic refreshing / lazy loading of RDF data </li></ul><ul><li>Many use cases and examples possible http://www.youtube.com/watch?v=r4WgTRIRoa0 </li></ul>

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Semantic Drupal: producing <ul><li>Drupal can automatically produce RDF / RDFa resources from version 6, Drupal database fields can be mapped to produce machine-readable semantic content </li></ul><ul><li>Drupal websites can become productive citizens in world of Linked Data http://sf2010.drupal.org/conference/sessions/story-rdf-drupal7-and-what-it-means-web-large </li></ul>

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Semantic Drupal: motivations <ul><li>Improved search engine results Yahoo reports 15% increase in click-through rates, BestBuy gains 30% traffic increase once RDFa included in web pages </li></ul><ul><li>Improved research & insight Connections between distributed data sets produce new insights (for example, linking people with locations, organisations, groups, etc) </li></ul><ul><li>Improved web management processes Mapping of CMS database fields supports automated inclusion of RDFa tags into web pages (reducing need for hand-crafting RDF code) and periodic updates of site-wide triple stores </li></ul>

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Semantic Drupal: current options <ul><li>Drupal 6, a mature CMS prototype RDF modules add semantic functionality (these ‘contributed’ modules have been developed by those working to include RDF in Drupal 7 ‘core’) </li></ul><ul><li>Drupal 7, currently in alpha 6 RDF functionality supported ‘out of the box’ (Drupal 7 full release expected soon) </li></ul>

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Semantic Drupal: v.6 details <ul><li>Drupal 6 ‘contributed’ modules provide key RDF functionality </li></ul><ul><li>Evoc Reference module: defines a field type for referencing RDF class or property from a node (web page) </li></ul><ul><li>RDF and RDF CCK modules: define mappings between fields and RDF elements, export nodes as RDF </li></ul><ul><li>External RDF Vocabulary Importer module: imports external vocabularies to be mapped with Drupal data objects </li></ul><ul><li>SPARQL API module: enables the use of SPARQL queries (local / remote graphs) </li></ul><ul><li>SPARQL endpoint module: exposes local RDF data in SPARQL endpoint </li></ul>

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Semantic Drupal: v.6 benefits <ul><li>Version 6 is first Drupal to support RDF </li></ul><ul><li>Automatic production of RDF pages (discoverable via ‘rel’ tag links in HTML headers) </li></ul><ul><li>Periodic generation of triple stores triples derive from all RDF files generated on the website, so these can be queried in Drupal website’s SPARQL endpoint (ARC2 library) – or elsewhere </li></ul>

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Semantic Drupal: v.6 challenges <ul><li>Drupal 6 RDF ‘contributed modules’ are prototypes </li></ul><ul><li>Drupal 6 lacks core RDF functionality, depends entirely upon ‘add-ons’ </li></ul>

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Semantic Drupal: v.7 details <ul><li>Drupal 7 ‘core’ RDF module produces extensive, well structured RDFa </li></ul><ul><li>RDF API enables other modules to consume and produce RDFa with relatively little extra effort </li></ul><ul><li>Expectation is that full range of prototype RDF modules can be improved and ported to Drupal 7, once released </li></ul>

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Semantic Drupal: v.7 benefits <ul><li>Drupal 7 automatically produces RDFa in all site pages (output as XHTML+RDFa 1.0) </li></ul><ul><li>Drupal 7 flexibly supports namespaces (website managers can add specialist namespaces if desired, in addition to ‘out of the box’ support for dc, foaf, sioc, etc) </li></ul>

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Semantic Drupal: v.7 challenges <ul><li>Drupal 7 currently in alpha </li></ul><ul><li>Full range of v.7 RDF ‘contributed’ modules not likely to be available from day one of Drupal 7 release </li></ul><ul><li>Planning for incremental module releases </li></ul>

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Semantic Drupal: v.7 guidance <ul><li>Drupal 7 RDF overviews http://semantic-drupal.com/ </li></ul><ul><li>Video tutorials on Drupal 7 setup http://semantic-drupal.com/setup </li></ul><ul><li>DrupalCon 2010 explanations of Drupal 7 RDF technology in context http://sf2010.drupal.org/conference/sessions/story-rdf-drupal7-and-what-it-means-web-large </li></ul>

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In practice: Drupal 6 & 7 examples http://iwmw-rdf.ukoln.info

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Semantic Drupal: discussion <ul><li>External RDF/XML vs. embedded RDFa </li></ul><ul><li>Key RDF tags / ontologies </li></ul><ul><li>Interoperability of RDF resources </li></ul>

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Contact information Dr. Thom Bunting UKOLN University of Bath Bath BA2 7AY United Kingdom Email: [email_address]

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Further information about UKOLN Web: www.ukoln.ac.uk Email: [email_address]