Overview
ISO/IEC 15938-5:2003/Amd 1:2004 is an amendment to Part 5 of the MPEG‑7 family (the Multimedia Content Description Interface). It defines XML schema extensions and semantic rules that expand multimedia description schemes (MDS) for audio, text, linguistic content, stream localization and subject classification. The amendment adds new attributes, datatypes and content-entity types to improve precise metadata encoding for multi‑channel audio, stream segments and richer classification vocabularies.
Key topics and technical requirements
- Audio descriptor extensions
- Adds an optional channels attribute to AudioDType and AudioDSType (type: integerVector).
- Semantics: if channels is absent, all audio channels are assumed; when present it lists channel numbers used to compute descriptors (supports multi‑channel formats such as 5.1).
- StreamLocator datatype
- Introduces StreamLocatorType (extends MediaLocatorType) containing a StreamSection element.
- StreamSection specifies start/length with units (e.g., bytes or characters) to locate data inside a stream; an open‑ended segment is allowed when only start is provided.
- New multimedia content entities
- LinguisticType - a MultimediaContent entity to describe linguistic content (LinguisticDocumentType).
- TextType - a MultimediaContent entity to describe textual segments (TextSegmentType).
- SubjectClassificationScheme DS
- Defines SubjectClassificationScheme Type (extends ClassificationSchemeBaseType) to encode complex thesauri.
- Adds subdelim attribute (default "--") to support subdivision tags (e.g., "Gambling--United States--1910-1920"); termID must be unique within the scheme.
- Schema-oriented definitions and examples
- Amendment contains concrete XML complexType snippets and usage examples (audio waveform descriptors with channel lists, linguistic annotation for sentences, text stream locators, and classification scheme encodings).
Applications and who uses it
- Multimedia metadata engineers and MPEG‑7 implementers who build interoperable description tools.
- Developers of digital asset management (DAM), media search/indexing, broadcasting and archival systems needing precise multi‑channel audio descriptors and stream-level localization.
- Libraries and cataloguers using structured classification schemes and thesauri (e.g., Library of Congress-style vocabularies).
- NLP and linguistic annotation tools that require standard XML encoding for textual and spoken content segments.
Related standards
- Part of the MPEG‑7 / ISO/IEC 15938 series (see ISO/IEC 15938-5 and related parts such as ISO/IEC 15938-4 for multi‑channel handling).
- Uses MPEG‑7 descriptor and description-scheme concepts (XML schema extensions consistent with the MPEG‑7 MDS model).
Keywords: MPEG‑7, ISO/IEC 15938-5 amendment, multimedia description schemes, AudioDType, AudioDSType, channels attribute, StreamLocator, SubjectClassificationScheme, linguistic annotation, XML schema, multimedia metadata.