This workshop was held together with ACM Multimedia and comprised an interesting keynote about semantic video annotation using ontologies. It seems that classical knowledge engineering is approaching the search/metadata/annotation community. Anyway, the talk was very interesting at it shows a way to generate more complex rules (SWRL) from basic rules based on the ontology. That is, annotating multimedia content by applying reasoning techniques on top of ontologies.
During this workshop I learned - among others - about Multimedia OWL (MOWL) that describes spatio-temporal relationships of objects within media including a probabilistic association thereof.
Btw. I also presented our results of the MPEG core experiement related to the semantics of MPEG-21 Digital Items. People agreed that we need an equivalent of an audio/video decoder but for metadata. Current metadata specifications define the syntax (+semantics) only but no means how to "decode" metadata.
ACM Multimedia 2009 will be held in Beijing and 2010 in Florence.