Harnessing The Semantic Web

Harnessing the Semantic Web
1st
December 2011

Common Misconceptions
● Is bleeding edge and still experimental
● Has been around a while and isn’t working
● Has a high learning curve and adoption cost
● Is all about unstructured content, nlp and SEO
● Semantic Web data integration is all about
query federation (EII) and never about
warehousing/ETL
● !New revenue stream – there's usually no spin
or too much in Semantic Web

Key use cases
● Query federation
● Linking data
● Inferring new data
● Data management

Core Concepts
● HTTP / URI’s (IRI's)
● http://www.w3.org/TR/cooluris
● http://ietf.org/rfc/rfc3987.txt
● RDF
● RDFS, OWL etc.
● SPARQL
● RDFa

RDF
Triples or Quads, e.g “Will knows Tim”
<http://www.akqa.com/staff#Will>
<http://xmlns.com/foaf/0.1/knows>
<http://www.akqa.com/staff#Tim>.
akqa:Will foaf:knows akqa:Tim.
<rdf:Resource rdf:about=”http://www.akqa.com/staff#Will>
<foaf:knows rdf:resource=”
http://www.akqa.com/staff#Tim” />
</rdf:Resource>
[{ "type" : "uri", "value" :
"http://www.akqa.com/staff#Will"},
"http://xmlns.com/foaf/0.1/knows",
{ "type" : "uri", "value" :
"http://www.akqa.com/staff#Tim"}]

RDFS, OWL, SKOS, RIF etc.
● Provide terms and axioms to create vocabularies,
ontologies and rules to describe data
● Also provide means to reason over data for
materialistic and deductive purposes
SubClassOf(
   :Father
   ObjectIntersectionOf( :Man :Parent )
)
EquivalentClasses(
   :NarcisticPerson
   ObjectHasSelf( :loves )
)
SubObjectPropertyOf(
   ObjectPropertyChain( :hasFather :hasBrother )
   :hasUncle
)

SPARQL
● SPARQL 1.1 Query
● SPARQL 1.1 Update
● SPARQL 1.1 Protocol for RDF
● SPARQL 1.1 Graph Store HTTP Protocol
● SPARQL 1.1 Entailment Regimes
● SPARQL 1.1 Service Description
● SPARQL 1.1 Federation Extensions

RDFa
● A means to embed RDF in an HTML document
● RDFa-core, RDFa-lite
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Books by Marco Pierre White</title>
  </head>
  <body>
    I think White's book
    '<span
     about="urn:ISBN:0091808189"
     typeof="http://purl.org/ontology/bibo/Book"
     property="http://purl.org/dc/terms/title"
     >Canteen Cuisine</span>'
    is well worth getting since although it's quite advanced stuff, he
    makes it pretty easy to follow. You might also like
    <span
     about="urn:ISBN:1596913614"
     typeof="http://purl.org/ontology/bibo/Book"
     property="http://purl.org/dc/terms/description"
     >White's autobiography</span>.
  </body>
</html>

Current Landscape
● RDF, RDFa:
● Freebase, Facebook, O'Reilly, Google (schema.org,
Rich Snippets)
● SPARQL
● Dbpedia, data.gov.uk, BBC, Open Linked Geo data,
Kasabi
● OWL
● Schemapedia, Swoogle

Case Study – VW.co.uk
● Car Options Ontology
● RDFa annotations
● Nutch Crawler
● PCMS data transformer
● Reasoner
● SPARQL endpoint

Examples
● Jdbc / sparql
● javascript

Harnessing The Semantic Web

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