Your SlideShare is downloading. ×
  • Like
Intro to the Semantic Web (Peter Snyder - CSG339 - NorthEastern University)
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Now you can save presentations on your phone or tablet

Available for both IPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Intro to the Semantic Web (Peter Snyder - CSG339 - NorthEastern University)

  • 752 views
Published

Slides from the presentation I gave in my Information Retrieval class at NorthEastern in June 2009. The class was taught by Javed Aslam.

Slides from the presentation I gave in my Information Retrieval class at NorthEastern in June 2009. The class was taught by Javed Aslam.

Published in Technology , Education
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
752
On SlideShare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
8
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Intro to the Semantic Web Peter Snyder snyderp@gmail.com 1
  • 2. Outline • What Is the Semantic Web? • What Problem is it Trying to Solve? • How does it Solve the problem? 2
  • 3. What is the SW? • Effort to 1. make data on the web machine friendly 2. using existing open technologies 3. in order to aid information retrieval 3
  • 4. What is the SW? .... • Made up of - XML - XML Schema - RDF - RDF Schema / OWL - SPARQL 4
  • 5. Outline • What Is the Semantic Web? • What Problem is it Trying to Solve? • How does it Solve the problem? 5
  • 6. What is the Problem? • Web is human oriented • All nonsense to machines • Humans waste time 6
  • 7. Example http://www.peteresnyder.com/fake <div> <h1>My Homepage</h1> <p>Hi, I'm Peter E. Snyder. <p>I live in Cambridge. <p>I like the band The Fall! <p>I love professional wrestling! </div> 7
  • 8. Outline • What is the semantic web? • What problem is it trying to solve? • How does it solve the problem? 8
  • 9. Solution • Basic Track (Microformats) • W3C Recommendation (Alphabet Soup) 9
  • 10. Microformats <div class="vcard"> <p> <a class="url" href="http://www.peteresnyder.com"> http://www.peteresnyder.com </a> </p> <p> <strong>Name:</strong> <span class="fn">Peter Snyder</span> </p> <p> <strong>City:</strong> <span class="locality">Cambridge</span> </p> </div> 10
  • 11. W3C Recommends... • XML • XML Schema • RDF • RDF Schema / OWL • SPARQL 11
  • 12. XML <?xml version="1.0"?> <person> <name>Peter Snyder</name> <website>http://www.peteresnyder.com<website> <city>Cambridge</city> <interests> <interest>The Fall</interest> <interest>Professional Wrestling</interest> </interests> </person> 12
  • 13. XML Schema XML Schema <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="person"> <xs:complexType> <xs:sequence> <xs:element name="website" type="xs:string"/> <?xml version="1.0"?> <xs:element name="name"xmlns:pes=”http://www.peteresnyder.com/fake_schema”> <person type="xs:string"/> <xs:element name="city" type="xs:string"/> <pes:name>Peter Snyder</pes:name> ... <pes:website>http://www.peteresnyder.com<pes:website> <pes:city>Cambridge</pes:city> <pes:interests> <pes:interest>The Fall</pes:interest> <pes:interest>Professional Wrestling</pes:interest> </pes:interests> </pes:person> 13 XML Document
  • 14. RDF • Resource Description Framework • Description of relationships (taxonomy) • Triplets - subject: thing being described (URI) - predicate: what the relationship is - object: the object being related to 14
  • 15. RDF Cont. <urn:name:peteresnyder> <name> "Peter Snyder" . <urn:name:peteresnyder> <city> "Cambridge" . <urn:name:peteresnyder> <likes> "The Fall" . <?xml version="1.0"?> <rdf:RDF> <Human rdf:about="urn:name:peteresnyder"> <name>Peter E Snyder</name> <city>Cambridge</city> <likes>The Fall</likes> ... 15
  • 16. RDF Schema / OWL • Defines a standard way that things interact (ontology) • Common Examples - Dublin Core: Publishing - Friend of a Friend (FOAF): People - OWL is RDFS+ 16
  • 17. RDFS / OWL Cont. FOAF RDF Schema <?xml version="1.0"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:foaf="http://xmlns.com/foaf/0.1/"> <foaf:Person rdf:about="urn:name:peteresnyder"> <foaf:homepage rdf:resource="http://www.peteresnyder.com"/> <foaf:givenname>Peter</foaf:givenname> <foaf:family_name>Snyder</foaf:family_name> <foaf:interest>The Fall</foaf:interest> .... 17
  • 18. SPARQL • SPARQL Protocol and RDF Query Language • SQL like language for getting data out of RDF connections / graphs 18
  • 19. SPARQL Cont. <foaf:Person rdf:about="urn:name:markesmith"> <foaf:Person rdf:about="urn:name:tinafey"> <foaf:homepage rdf:resource="http://www.peteresnyder.com"/> <foaf:Person rdf:about="urn:name:peteresnyder"> <foaf:homepage rdf:resource="http://www.peteresnyder.com"/> <foaf:givenname>Peter</foaf:givenname> <foaf:homepage rdf:resource="http://www.peteresnyder.com"/> <foaf:givenname>Peter</foaf:givenname> <foaf:family_name>Snyder</foaf:family_name> <foaf:givenname>Peter</foaf:givenname> <foaf:family_name>Snyder</foaf:family_name> <foaf:interest>The Fall</foaf:interest> <foaf:family_name>Snyder</foaf:family_name> <foaf:interest>The Fall</foaf:interest> ... <foaf:interest>The Fall</foaf:interest> ... ... + PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?givenname ?family_name WHERE { ?x foaf:interest "The Fall"} = ?givenname ?family_name “Peter” “Snyder” “Mark” “Smith” 19
  • 20. Conclusion Current Web Semantic Web <div> <?xml version="1.0"?> <h1>My Homepage</h1> <rdf:RDF xmlns:foaf="http://xmlns.com/foaf/0.1/"> <p>Hi, I'm Peter E. Snyder. <foaf:Person rdf:about="urn:name:peteresnyder"> <foaf:homepage rdf:resource="http:// <p>I live in Cambridge. www.peteresnyder.com"/> <p>I like the band The Fall! <foaf:givenname>Peter</foaf:givenname> <p>I love professional <foaf:family_name>Snyder</foaf:family_name> wrestling! <foaf:interest>The Fall</foaf:interest> </div> ... 20