RDF and Drupal - The Semantic web

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

Explosion
of
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 understandable
RDF
Federated Dataset
Linked Data
SPARQL
Global Giant Graph

Machine Understandable

RDF
Resource
Description
Framework

RDF
Everything is a resource
A resource is a named thing
this
www.example.com#this
example:this
CURIE

RDF
A resource can be a Document
A resource can be an organization
A resource can be a person
foaf:Document
foaf:Organization
foaf:person
foaf:name - Gaurav
foaf:mail - gaurav.kumar@blisstering.com
foaf:birthday– 25/10/1987

RDF
and describe how that person is related to other resources
swrc:employee
foaf:made
gaurav:me
dplp:this
blisstering:this

RDF
<?xml version="1.0"?>
<rdf:RDFxmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#
xmlns:dc="http://purl.org/dc/elements/1.1/">
<rdf:Descriptionrdf: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 attributes
Provides 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

SPARQL
Query the Giant Global Graph using SQL?
SPARQL

Key Terms
Machine understandable
RDF
Federated Dataset
Linked Data
SPARQL
Global Giant Graph

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

RDF in Drupal 7 : The Spices
Attributes

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();
*/
functionmyrdfmodule_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 Mappings
function 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/gauravkumar87
We’re hiring!!!
Write to info@blisstering.com
or come find me at the conference

http://localhost	1201
http://www.blisstering.com	423
http://blisstering.m2serve.info	216
http://blisstering.com	150
http://www.bliss-dev.com	90
http://bliss-dev.com	18
http://165.225.132.60	6
http://8.17.80.202	2

RDF and Drupal - The Semantic web

by gauravkumar87

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