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What is it all about media in the Semantic Web? At a glance see a collection of relevant links at del.icio.us/mhausenblas/semantic_web+multimedia. In general, media semantics covers the description, extraction, and usage of multimedia items (such as videos, images, sound, etc.) on the SW. Several standards (MPEG-7 and the like) and diverse ontologies have been proposed to describe low-level semantics of media content, though one of the key problems remains:
The Semantic Gap
Due to the extensive work that has been done (and still is going on) in the W3C Multimedia Semantics Incubator Group, I'd like to point the reader to the corresponding pages there:
For an overview of existing multimedia vocabularies and their formal representation, have a look at: Multimedia Semantics on the Web: Vocabularies (Editors: Michael Hausenblas, Raphaël Troncy, Christian Halaschek-Wiener, Tobias Bürger, and Oscar Celma)
For semantic descriptions of still images see: Image Annotation on the Semantic Web (Editors: Jacco van Ossenbruggen Raphaël Troncy, Giorgos Stamou, and Jeff Z. Pan)
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