Semantic DrupalRDF in Drupal 7 and what it means for the web at

large

Gaurav Kumar

Gaurav Kumar• Team Lead at Blisstering Solutions• With Drupal for 3 years• Lead Architect of m2Serve, a multi-modal

Drupal based platform• Maintainer of the mailalias module on

drupal.org• Works with multiple technologies – Mobile,

Voice, Web

Explosionof

Social networks

and collaborative applications

Need a way to connect these

People can move from one to another and

bring their data.

People can make sense out of data.

“On the Internet, nobody knows you’re a dog”

Semantic Web

Semantic Web Benefits• Programs and 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 Terms

Machine understandableRDF

Linked DataSPARQL

Global Giant Graph

Federated Dataset

Machine Understandable

RDF

Resource

Description

Framework

RDFEverything is a resource

A resource is a named thing

this

www.example.com#thisexample:this CURIE

RDFA resource can be a Document

A resource can be an organizationA resource can be a person

foaf:Document foaf:Organization foaf:person

foaf:name - Gauravfoaf:mail - gaurav.kumar@blisstering.comfoaf:birthday – 25/10/1987

RDFand describe how that person is related to other resources

dplp:this blisstering:this

gaurav:me

swrc:employeefoaf:made

RDF<?xml version="1.0"?>

<rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#

xmlns:dc="http://purl.org/dc/elements/1.1/">

<rdf:Description rdf:about="http://www.google.com">

<dc:creator>Larry Page</dc:creator> </rdf:Description>

</rdf:RDF>

RDF Triples (N3)

vendor1:productX dc:title "Cool-O-Matic" . vendor1:productX retail:price "$50.75" .

vendor1:productX vendor1:partno "TTK583" . vendor1:productY dc:title "Fluffertron" . vendor1:productY retail:price "$26.50" .

vendor1:productY vendor1:partno "AAL132" .

RDF Graphs

RDF Vocabularies

RDF Schema Web Ontology Language

Dublin Core Friend of a Friend

Simple Knowledge Organization System vCard RDF Encoding

RDF and RDFa

RDFa = RDF in attributesProvides a way to use RDF with HTML

RDF and RDFa

<div xmlns:dcmi="http://purl.org/dc/elements/1.1">

<h1 property="dcmi:title">OSI Days</h1> <h3 property="dcmi:creator">Gaurav

Kumar</h3>

Giant Global Graph

ONE GIANT DATABASE

SPARQLQuery the Giant Global Graph

using SQL?

SPARQL

Key Terms

Machine understandableRDF

Linked DataSPARQL

Global Giant Graph

Federated Dataset

Drupal and RDF – A good match?

• Both maintain structured data• Drupal’s structure is in the Database• Drupal’s field names are unique to the website• Both maintain structured data in similar ways

RDF in Drupal

• rdf.php (Dries, 2000)• FOAF, vCard (walkah, 2004)• Relationship (dman, 2005)• Semantic Search (hendler, 2006)• RDF (Arto, 2007)• OpenCalais (febbraro, 2008)• RDF CCK (scor, 2008)

Why RDF ?

• W3C Standards• BBC, New York Times, Reuters, Facebook,

Linkedin• Google, Yahoo• Don’t Repeat Yourself

RDF in Drupal 7

• In Core!!!• FOAF, SIOC, SKOC, DC “out of the box”• All users have a web ID user/3#me• All entities have a unique ID

RDF in Drupal 7 : The Spices• Entity Types

node comment user

File Term Vocabulary

RDF in Drupal 7 : The Spices• Attributes

title date All fields

Comment count Reply of creator

Drupal 7 : Default Mappings

Use Cases

Rich Search Result

Use Cases

RDF web page :

http://openspring.net/blog/2009/05/12/half-way-through-the-rdf-code-sprint-google-announces-support-for-rdfa

Inspection :

http://inspector.sindice.com/inspect?url=http://openspring.net/blog/2009/05/12/half-way-through-the-rdf-code-sprint-google-announces-support-for-rdfa#GRAPH

Web at Large and Drupal

• Drupal = Pioneer CMS• Platform of choice for many use cases• Influence the Trends• More RDF data on the web

The time to adopt RDF is NOW!

What’s coming up

• RDF Mapping User Interface• SPARQL Endpoint• RDF Proxy

Modify / Create RDF Mappings/*** Implements hook_rdf_namespace();*/

function myrdfmodule_rdf_namespace(){

return array(‘gr’ => ‘http://purl.org/goodrelations/w1#’‘product’ => ‘http://search.yahoo.com/searchmonkey/product/”

http://drupal.org/node/622170

Modify / Create RDF Mappingsfunction node_rdf_mapping() { return array( array( 'type' => 'node', 'bundle' => RDF_DEFAULT_BUNDLE, 'mapping' => array( 'rdftype' => array('sioc:Item', 'foaf:Document'), 'title' => array( 'predicates' => array('dc:title'), ),...

Some Resources

•http://groups.drupal.org/semantic-web•http://semantic-drupal.com/•http://www.w3.org/RDF/

Thank you.

Contact me:• gaurav.kumar@blisstering.com•Linkedin.com/in/gauravkumar87We’re hiring!!!• Write to info@blisstering.com• or come find me at the conference