From SMW+ Semantic Enterprise Wiki
Some SemTech2009 highlights
Over 1000 participants were count on SemTech, the premier event for applications of semantic technology and the semantic web.
General trends this year were RDF(S), RDFa, OWL, SPARQL and also Linked Data or rather the Linking Open Data Project
It is very interesting that both Yahoo! and Google are looking at microformats and RDFa.
| W3C with more than 30 W3C Member organizations presented at the Semantic Technology Conference in San Jose, California. W3C gave an intro tutorial to Semantic Web (Slides are available here). | 
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Short Overview – Introduction to the Semantic Web
- The Semantic Web is a collection of standard technologies to realize a Web of Data
- In order that the Web of Documents (a.k.a. Web 1.0) becomes a Web of Data, standardization is needed; furthermore
- use URI-s to publish data
- link URIs to data, not only to webpages
- characterize/classify the data and the links to convey meaning
- use RDF Triples
- add machine-readable information
- let the network effect walk its way
- Linking Open Data Project
- Set RDF links among the data items from different datasets
- Set up query endpoints
- Altogether we receive billions of triples, millions of links, like for example in DBpedia
- RDF data access
- querying RDF graphs, best method SPARQL
- Limit the number of returned results; remove, duplicates, sort, …
- Optional branches in the query
- Specify several data sources (via URI-s) within the query to merge
- Construct a graph combining a separate pattern and the query results
- Use datatypes and/or language tags when matching a pattern
- SPARQL is usually used over the network
- separate documents define the protocol and the result format
- SPARQL Protocol for RDF with HTTP and SOAP bindings
- SPARQL results in XML or JSON formats
- Big datasets usually offer "SPARQL endpoints" using this protocol (e. g. DBpedia)
- Web Ontology Language (OWL)
- OWL is an extra layer, a bit like RDF Schemas
- own namespace, own terms
- it relies on RDF Schemas
- It is a separate recommendation
- OWL 1.0 specification
- update to OWL 2.0 coming 2009
W3C has also given an overview of what is happening at W3C this year:
- POWDER Proposed Recommendation published on June, 4th
- SKOS Proposed Recommendation published on June, 15th
- OWL 2.0 Candidate Recommendation published on June, 11th
Have a look at the full presentation: Pdf:Tutorial_W3C.pdf
There are no more presentations available yet, so stay tuned for more reports!
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