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A Comparison of Schemas for Video Metadata Representation

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In the past, a lot of effort has gone into generating descriptors and description schemes for video indexing but comparatively little research has been done on schemas capable of defining the structure, content and semantics of video documents and enabling validation and higher levels of automated content checking. This paper compares the capabilities of the RDF Schema, Extensible Markup Language (XML) Document Type Definitions (DTD's), Document Content Description (DCD) and Schema for Object-Oriented XML (SOX), for supporting and validating hierarchical video descriptions based on Dublin Core, MPEG-7 and a specific hierarchical structure. Finally this paper proposes a hybrid schema based on features from each of these schemas which will satisfy the MPEG-7 Description Definition Language (DDL) requirements.

This paper provides a good, practical comparison between a number of schema languages. Unfortunately it only mentions XML Schema in passing as it predates the work on this proposed standard.

Standards discussed by this literature

• XML Schema - Rigorous Validity Checking for XML Documents