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Semantic Web

This review agenda covers topics such as URI, XML, RDF, RDF/XML, RDFS, SPARQL, reification, design patterns, and more. It also includes examples and exercises.

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Semantic Web

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  1. Semantic Web Exam 1 Review

  2. Agenda • URI • XML • RDF • RDF/XML • RDFS • SPARQL • Reification • Design Patterns

  3. soap://www.visa.com/CreditCardService# URI Jargon Summary URI Context URISchemeName:schemeSpecificPart Scheme Name Scheme Specifics Part QName XMLNS Context Qualified Name (QName) – as text macro for entity and attribute names !ENTITY Context Text macro for attribute values (dereference with &;)

  4. URI Jargon Summary Valid URI Examples URISchemeName:schemeSpecificPart urn:monterey#1 sc:johnny http://utdallas/semclass#

  5. XML structure • XMLNS scope and effect • !ENTITY usage • Entity, attribute, content • Reading RDF/XML

  6. RDF & RDF/XML • Verbs (properties) defined in RDF • Usage and meaning • Reading RDF/XML • How many triples? • What graph structure? • Classes, properties, and short-cuts • Limitations of RDF and RDF/XML for semantic web needs • Writing RDF/XML statements • Point to a literal • Point to an existing resource (i.e. rdf:resource)

  7. RDF & RDF/XML • Draw graph from RDF/XML and N3 data • Resources as circles/ellipses and literals as boxes. • Short labels in each shape and on lines • Bring a pencil if you have trouble making figures with pen • Note that containers include a rdf:type node and use _1, _2, etc • Collections do not use a type node and use ‘first’, ‘rest’, and nil

  8. RDFS • Verbs (properties) defined in RDFS • Emphasis on: • subClassOf and subPropertyOf • domain and range • Transitive relationships

  9. RDF/RDFS Example <?xml version="1.0"?> <!DOCTYPE rdf:RDF [<!ENTITY exterms " http://www.example.org/terms/">]> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:exterms="http://www.example.org/terms/" xmlns:other="uri:"> <rdfs:Property rdf:about="&exterms;creation-date"> <rdf:Description rdf:about="http://www.example.org/index.html"> <exterms:creation-date>August 16, 1999</exterms:creation-date> <dc:language>en</dc:language> <dc:creator rdf:resource="http://www.example.org/staffid/85740"/> </rdf:Description> <rdf:Statement> <rdf:subject rdf:resource=" http://www.example.org/index.html"/> <rdf:predicate rdf:resource=“&exterms;creation-date"/> <rdf:object>August 16, 1999</rdf:object> <dc:creator>"Stewart"</dc:creator> <other:creatorConfidenceInFact>"95%"</other:creatorConfidenceInFact> </rdf:Statement> </rdf:RDF> Creation-date is a property. (Makes a triple) This “Statement” (i.e. reification) is a blank node Stewart claims he knew the creation date and his confidence in it.

  10. SPARQL • Writing SPARQL SELECT queries • Query for all triples • Blank node handling and meaning • Handling containers - Query for one or more specific elements off the container (hint: use UNION) • Text macros • BASE, PREFIX • Handling containers and collections • Named Graphs and default graph • Use of UNION Especially consider Sparql_PopQuizAndInClassLab.ppt

  11. Reification • Meaning of reification • Reification class type and required properties • Meaning of metadata from reification node • Meaning of multiple reification nodes

  12. Design Patterns • Pattern Categories • Architectural vs Design vs Idioms • For patterns presented • The need for the pattern • The foundational idea of the pattern • Specifically info in Lecture 4 –SubsetOfHeadsUpPatterns.ppt

  13. Ontologies • VCARD • For personal business cards (pretty much contact info) • Dublin Core • For basic metadata – creators, dates, scope of creations/entities • FOAF • For friendships, working relationships to others, organizations, and groups

  14. Not covering • New material presented from Ch 10 and 11 (i.e. OWL) • New material presented in Ontology Design 101 • Jena specifics • UML and Lecture 6 design patterns

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