1. Architecture Matters! Semantic Structures for Teaching and Learning JISC CETIS Conference 2007 Mikael Nilsson Royal Institute of Technology, StockholmUppsala University 1 The Knowledge Management Research Group

2. Semantic application support a high-level viewImplementing semantics requires high degree of system maturity Top-down: What processes do we want to support? What key pieces of information are we processing? What are the user roles and functions in the system? Bottom-up: architectural stability and completeness Web Architecture support for semantics is still being defined....2 The Knowledge Management Research Group 3. The Web Architecture perspective Web architecture now supports novel methods of getting at the data: SPARQL endpoints REST-based services that emit RDF Content-negotiation (Linked Data web) Accepts: application/rdf+xml HTTP redirectsGRDDL for automatic RDF views of XML data Requires well-designed Web applications & URIs Part of Semantic Web is just well-designed Web presence (follow your nose)!3 The Knowledge Management Research Group 4. Stabilising the architecture Microformat Semantics Ubiquitous semantics:GRDDL Linked DataExposing semantics: Vocabulary Web presence (SKOS) RDF in HTML (RDFa) REST Services Services in the Web:Getting raw data:Content Negotiation SPARQLDescriptions:Domain vocabulary RDF RDF Schema OWLIdentity & location: HTTPURIs 4 The Knowledge Management Research Group 5. Evolving the domain vocabularies ??? IEEE LOM in RDFLibrary 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 SemanticsDublin Core Abstract GRDDL Linked DataVocabulary Web presence (SKOS) RDF in HTML (RDFa) Model (June 2007)REST ServicesContent NegotiationSPARQL HTTP URIsRDFRDF Schema OWL 5 The Knowledge Management Research Group 6. Comments? 6 The Knowledge Management Research Group