The W3C Media Annotations Working Group has recommended Ontology For Media Resources 1.0. The aim is to connect many media resource descriptions together and provide a core set of properties that can be to used to express them. This ontology also defines their mappings to elements from a number of other metadata formats also:
“This document defines the Ontology for Media Resources 1.0. The term “Ontology” is used in its broadest possible definition: a core vocabulary. The intent of this vocabulary is to bridge the different descriptions of media resources, and provide a core set of descriptive properties. This document defines a core set of metadata properties for media resources, along with their mappings to elements from a set of existing metadata formats. Besides that, the document presents a Semantic Web compatible implementation of the abstract ontology using RDF/OWL. The document is mostly targeted towards media resources available on the Web, as opposed to media resources that are only accessible in local repositories.” [Read More]
See also the W3C blog for more information and the announcement of the recommendation.