Architecture Matters!
Semantic Structures for Teaching and Learning
JISC CETIS Conference 2007
Mikael Nilsson <mikael@nilsson.name>
Royal Institute of Technology, Stockholm
Uppsala University
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The Knowledge Management Research Group

Semantic application support
– a high-level view
Implementing semantics requires high degree of
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system maturity
Top-down:
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What processes do we want to support?
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What key pieces of information are we processing?
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What are the user roles and functions in the system?
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Bottom-up:
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architectural stability and completeness
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Web Architecture support for semantics is still
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being defined....
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The Knowledge Management Research Group

The Web Architecture perspective
Web architecture now supports novel methods of
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getting at the data:
SPARQL endpoints
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REST-based services that emit RDF
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Content-negotiation (“Linked Data” web)
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Accepts: application/rdf+xml
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HTTP redirects
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GRDDL for automatic RDF views of XML data
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Requires well-designed Web applications & URIs
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Part of Semantic Web is just well-designed Web
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presence (“follow your nose”)!
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The Knowledge Management Research Group

Stabilising the architecture
Microformat Semantics
Ubiquitous semantics:
GRDDL Linked Data
Exposing semantics: Vocabulary Web presence (SKOS) RDF in HTML (RDFa)
REST Services
Services in the Web:
Getting raw data: Content Negotiation SPARQL
Descriptions: Domain vocabulary RDF RDF Schema OWL
Identity & location: HTTP URIs
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The Knowledge Management Research Group

Evolving the domain vocabularies
???
IEEE LOM in RDF Library Data (RDA)
(March 2008) in RDF (2009)
Dublin Core in Dublin Core in Dublin Core Terms
HTML (Dec 2007) XML (2008) (Dec 2007)
Dublin Core in RDF
(June 2007)
Microformat Semantics
Dublin Core Abstract
GRDDL Linked Data
Vocabulary Web presence (SKOS) RDF in HTML (RDFa)
Model (June 2007)
REST Services
Content Negotiation SPARQL
HTTP URIs RDF RDF Schema OWL
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The Knowledge Management Research Group

Comments?
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The Knowledge Management Research Group