RDF presentation at DrupalCon San Francisco 2010

The story of RDF in Drupal 7 and what it means for the Web at large Stéphane “scor” Corlosquet Lin Clark

Stéphane “scor” Corlosquet •Mass General Hospital •4 years with Drupal •Security team •Drupal 7 RDF module maintainer

Lin Clark •DERI Galway •2 years with Drupal •Documentation team •Drupal 7 RDF contributor and evangelist extraordinaire

Semantic Web beneﬁts

Semantic Web beneﬁts  Programsand sites can exchange information

Semantic Web beneﬁts my-site.net your-site.org  Programsand sites can exchange information

Semantic Web beneﬁts my-site.net company.com your-site.org  Programsand sites can exchange information

Semantic Web beneﬁts my-site.net company.com your-site.org  Programsand sites can exchange information  Search engines can display more relevant information in results

Semantic Web beneﬁts my-site.net company.com your-site.org  Programsand sites can exchange information  Search engines can display more relevant information in results  Data mashers can combine data from different datasets to find new and astounding things

Semantic Web beneﬁts my-site.net company.com your-site.org  Programsand sites can exchange information  Search engines can display more relevant information in results  Data mashers can combine data from + different datasets to find new and astounding things

Key (confusing) terms

Key (confusing) terms Machine Understandable

Key (confusing) terms Machine Understandable RDF

Key (confusing) terms Machine Understandable Linked Data RDF

Key (confusing) terms Machine Understandable Linked Data SPARQL RDF

Key (confusing) terms Machine Understandable Linked Data SPARQL RDF Federated Dataset

Key (confusing) terms Machine Understandable Linked Data SPARQL RDF Giant Global Federated Dataset Graph

Machine Understandable

Machine Understandable The Semantic Web helps machines understand what the information on a Web page is...

Machine Understandable The Semantic Web helps Lin Clark is a name machines understand what the information on a Web page is...

Machine Understandable Lin Clark is a name

Machine Understandable and the relationships Lin Clark is a name between different pieces of information.

Machine Understandable and the relationships between different pieces of information.

Machine Understandable linclark.jpg is a picture and the relationships of a person named between different pieces of Lin Clark information.

RDF R esource Description F ramework

RDF Everything is a resource

RDF Everything is a resource A resource is a named thing

RDF Everything is a resource A resource is a named thing this

RDF Everything is a resource this

RDF Everything is a resource A resource is a uniquely named thing this

RDF Everything is a resource A resource is a uniquely named thing

RDF Everything is a resource A resource is a uniquely named thing http://lin-clark.com/page.html#this

RDF Everything is a resource A resource is a uniquely named thing URI http://lin-clark.com/page.html#this

RDF Everything is a resource A resource is a uniquely named thing http://lin-clark.com/page.html#this

RDF Everything is a resource A resource is a uniquely named thing

RDF Everything is a resource A resource is a uniquely named thing lin:this

RDF Everything is a resource A resource is a uniquely named thing Namespace xmlns:lin=”http://lin-clark.com/page.html# lin:this

RDF Everything is a resource A resource is a uniquely named thing Namespace xmlns:lin=”http://lin-clark.com/page.html# CURIE lin:this

RDF A resource can be a document dblp:this

RDF A resource can be a document foaf:Document dblp:this

RDF A resource can be a company deri:this

RDF A resource can be a company foaf:Organization deri:this

RDF A resource can even be a person lin:me

RDF A resource can even be a person foaf:Person lin:me

RDF You can describe properties of that person... lin:me

RDF You can describe properties of that person... foaf:name Lin Clark lin:me

RDF You can describe properties of that person... foaf:name Lin Clark foaf:mbox lin.clark@deri.org lin:me

RDF You can describe properties of that person... foaf:name Lin Clark foaf:mbox lin.clark@deri.org foaf:birthday 07-01 lin:me

RDF and describe how that person is related to other resources

RDF and describe how that person is related to other resources deri:this

RDF and describe how that person is related to other resources swrc:employs deri:this

RDF and describe how that person is related to other resources swrc:employs lin:me deri:this

RDF and describe how that person is related to other resources foaf:made swrc:employs lin:me deri:this

RDF and describe how that person is related to other resources foaf:made swrc:employs lin:me dblp:this deri:this

Federated Dataset the resources can be distributed across the Web in a federated datagraph

Giant Global Graph And when all resources are described this way, the Web becomes one giant database...

Giant Global Graph

SPARQL Find and retrieve information from the graph

SPARQL Find and retrieve information from the graph using SQL?

SPARQL Find and retrieve information from the graph

SPARQL Find and retrieve information from the graph using SPARQL

The Semantic Web

The Semantic Web Machine Understandable

The Semantic Web Machine Understandable RDF

The Semantic Web Machine Understandable Linked Data RDF

The Semantic Web Machine Understandable Linked Data RDF Federated Dataset

The Semantic Web Machine Understandable Linked Data RDF Giant Federated Dataset Global Graph

The Semantic Web Machine Understandable Linked Data SPARQL RDF Giant Federated Dataset Global Graph

Why Drupal?

Why Drupal? Similarities

Why Drupal? Similarities •Both have structured data

Why Drupal? Similarities •Both have structured data •Data is structured in a similar way— instances of types with properties and relationships

Why Drupal?

Why Drupal? Differences

Why Drupal? Differences •Drupal’s structure stays hidden in the database, RDF structure is exposed on the page

Why Drupal? Differences •Drupal’s structure stays hidden in the database, RDF structure is exposed on the page •Drupal’s ﬁeld names are unique to the site, RDF terms are universally dereferencable and explicitly deﬁned

History of Semantics in Drupal •rdf.php (2000, Dries) •FOAF, vCard (2004, walkah) •Relationship (2005, dman) •Semantic Search (2006, hendler)

History of Semantics in Drupal •RDF (2007, Arto) •OpenCalais (febbraro, 2008) •RDF CCK (2008, scor) •and more...

RDF in Drupal 7 - the story so far "video from the future" DrupalCon Boston 2008

RDF in Drupal 7 - the story so far May 2009 DERI, Galway

RDF in Drupal 7 - the story so far Danbri (Mr. FOAF) DrupalCon Paris 2009

RDF in Drupal 7 - the story so far

RDF in Drupal 7 - the story so far •61 issues in total •11 months of coding •401 lines of code •372 lines of documentation •537 lines of tests

RDF vs RDFa •Semantic vs. syntax •Meaning vs. languages •Data vs. JSON, XML •RDFa = RDF in attributes

Microformats vs. RDFa unofficial and ad hoc standardized HTML4, XHTML 1.0 XHTML 1.1, HTML 5 flat namespace XML namespaces defined by one interoperable organization definitions

RDF and RDFa? •W3C standards •BBC, New York Times, Reuters, Facebook •Google, Yahoo! •Don’t Repeat Yourself (DRY)

RDFa and e-Commerce: BestBuy •GoodRelations •30 % percent increase in traffic •Yahoo observes a 15% increase in the Click-through-Rate http://rdfa.info/2009/12/11/best-buy-and-rdfa/

Demo: Enriched search results with Drupal 7’s RDFa

The Web at large •Drupal = pioneer CMS •Platform of choice for many use cases •Inﬂuence the trends •More RDF data on the Web

A closer look at RDF in Drupal 7

RDF spices •All entity types: node comment user ﬁle term vocabulary

RDF spices •Attributes: date (created, title updated) all ﬁelds comment count reply of (comment) creator

Drupal 7 entities “cool URIs” •All entities have their own unique URI •node/3 •comment/6#comment-6 •user/2 •taxonomy/term/5 http://www.w3.org/TR/cooluris/

Drupal 7 RDFa goodness •FOAF, SIOC, SKOS, DC “out of the box” •All users have a WebID user/3#me => foaf:Person FOAF+SSL authentication (contrib) http://www.w3.org/TR/cooluris/

Drupal 7 default mappings dc:title name vocabulary rdfs:comment term description skos:Concept Scheme skos:inScheme skos:prefLabel, name rdfs:label term skos:definition description skos:Concept skos:broader dc:subject dc:title title node dc:created, dc:date creation date user sioc:has_creator sioc:Item, sioc:User foaf:Document dc:modified modification date Account content:encoded body sioc:num_replies number replies foaf:page foaf:name sioc:has_creator sioc:reply_of dc:title title homepage user name comment dc:created, dc:date creation date sioc:Post, sioct:Comment dc:modified modification date content:encoded sioc:reply_of body

RDFa demo: how machines see Drupal pages •Ubiquity RDFa •Sindice - The Semantic Web index http://ubiquity-rdfa.googlecode.com/svn/trunk/ubiquity-loader.js http://sindice.com/

Blog post as a graph

What’s coming up

What’s coming up RDF Mapping User Interface for site administrators to customize mappings

What’s coming up

What’s coming up SPARQL Endpoint: anyone can query your site data with SPARQL queries

What’s coming up SPARQL Endpoint: anyone can query your site data with SPARQL queries Figure 3.6: A list of SPARQL results (left) and an RDF S

What’s coming up

What’s coming up RDF Proxy: A way of connecting nodes to RDF sources across the Web and automatically updating your site’s information when it is changed at the source

What’s coming up RDF Proxy: A way of connecting nodes to RDF sources across the Web and automatically updating your site’s information when it is changed at the source my-site.net company.com your-site.org

RDF in Drupal 7 for developers http://api.drupal.org/api/group/rdf/7

RDF namespaces declaration http://drupal.org/node/721082

RDF mappings deﬁnition

RDF namespaces declaration

Drupal 7 RDFa internals •Mappings cached with entity info (fast) •RDFa markup added via the theme layer. Impacts performance on pages with many comments: turn on page cache.

Credits Mark Birbeck Christopher Ruppel Johannes Keizer Alex Bronstein Kanok Ausawawaranun Hobury John Breslin John Breslin Benjamin Doherty Benjamin Doherty Scriptall Giorgos Kontopoulos Stefan Freudenberg cocoate Thomas Speer Rolf Guescini Frank Febbraro Łukasz Kowalski Daniel F. Kudwien Florian Lorétan Dirk Ruediger Raul Pedro Fernandes Frédéric Marand Lin Clark Santos Benjamin Melançon Prometheus Alexander Langer John Morahan William Hayes Robert Douglass Dries Buytaert Christopher Albrecht Rob Loach Angie Byron Roundabout Publications Andrew Kennedy catch Aris Vidalis Knud Moeller chx Gerard Roos Udo Gerhards Peter Wolanin Ludovico Fischer Barry Jaspan yched

Thanks! http://semantic-drupal.com/

What did you think? Step 1: Locate this session on the DCSF site http://sf2010.drupal.org/conference/schedule Step 2: Click the “Take Survey” link

http://www.slideshare.net	17
http://bigadda.bliss-dev.com	17
http://paper.li	5
http://localhost	2

RDF presentation at DrupalCon San Francisco 2010

by scorlosquet

Accessibility

Categories

Upload Details

Usage Rights

4 Embeds 41

Statistics