This document gives an overview on the state-of-the-art of multimedia metadata formats. Initially, practical relevant vocabularies for developers of Semantic Web applications are listed according to their modality scope. In the second part of this document, the focus is set on the integration of the multimedia vocabularies into the Semantic Web, that is to say, formal representations of the vocabularies are discussed.
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W3C technical reports
Knowledge Space of Semantic Inference for Automatic Annotation and Retrieval of Multimedia Content
Human-Centered Data Analytics

Troncy, R, Hausenblas, M, Boll, S.C.J, Bürger, T, Celma, O, Halaschek-Wiener, C, & Mannens, E. (2007). Multimedia Vocabularies on the Semantic Web. W3C technical reports. W3C.