MPEG-7 can be used to create complex and comprehensive metadata descriptions of multimedia content. Since MPEG-7 is defined in terms of an XML schema, the semantics of its elements have no formal grounding. In addition, certain features can be described in multiple ways. In order to make MPEG-7 interoperable with domain-specific ontologies, the semantics of the MPEG-7 descriptors also need to be expressed formally in an ontology. This article describes four independent approaches to build a multimedia ontology based on the MPEG-7 standard and discusses the similarities and differences between them.
[PDF] MPEG-7 based Multimedia Ontologies: Interoperability Support or Interoperability Issue? | Semantic Scholar