MPEG doc#: N8335
Date: July 2006
ISO/IEC 15938 (MPEG-7) specifies a metadata system for describing multimedia content. It comprises a number of parts enabling descriptions for multimedia content including visual descriptions, and audio descriptions. Multimedia descriptions are expressed using the Description Definition Language (DDL) from ISO/IEC 15938-2. DDL is an XML-based language and syntax for the multimedia descriptions is expressed using W3C XML Schema.
Schema definitions are specified in the relevant parts of ISO/IEC 15938. Part 10 of ISO/IEC 15938 specifies the schema definition across all parts of ISO/IEC 15938. It collects the description tools specified in ISO/IEC 15938, assigns a namespace designator, and specifies the resulting syntax description in a single schema using Description Definition Language (DDL) from ISO/IEC 15938-2. The frequency of creation of versions of the schema can depend on a number of factors, including the frequency of creation of amendments to ISO/IEC 15938.
 ISO/IEC, Information technology – Multimedia content description Interface – Part 10: Schema definition, ISO/IEC 15938-10:2005, April 2005.
 ISO/IEC, Information technology – Multimedia content description interface – Part 2: Description definition language, ISO/IEC 15938-2:2002, April 2004.
 W3C, XML Schema Part 1: Structures Second Edition, W3C Recommendation REC-xmlschema-1-20041028, 28 October 2004.
 W3C, XML Schema Part 2: Datatypes Second Edition, W3C Recommendation REC-xmlschema-2-20041028, 28 October 2004.