This International Standard specifies a metadata system for describing multimedia content. This documentspecifies the Multimedia Description Schemes (MDS) description tools (Description Schemes, Descriptors, anddatatypes) that comprise ISO/IEC 15938-5. The following set of subclauses are provided for each MDS descriptiontool, where optional subclauses are indicated as (optional): Syntax: specifies the normative syntax of the description tool using Description Definition Language (DDL) (seeISO/IEC 15938-2). Binary syntax (optional): specifies the normative binary representation for the description tool, where relevant.If a binary syntax is not specified, then the binary coding method of ISO/IEC 15938-1 shall apply for thedescription tool.Semantic: specifies the normative semantics of the description tool and each of its components (attributes andelements). Informative examples (optional): provides informative examples that illustrate the use or instantiation of thedescription tool in creating descriptions