ISO/IEC 15938-5:2003

Overview

ISO/IEC 15938-5:2003 - part of the MPEG‑7 family - specifies the Multimedia Description Schemes (MDS) used to describe multimedia content. The standard defines the normative syntax (using the Description Definition Language, see ISO/IEC 15938-2) and semantics for description tools: Description Schemes (DS), Descriptors (D) and datatypes. It also provides informative examples showing how to instantiate these tools to create interoperable multimedia metadata.

Keywords: ISO/IEC 15938-5:2003, MPEG-7, multimedia metadata, Description Schemes, DDL, multimedia content description interface

Key topics and technical requirements

• Schema tools and root element: framework for packaging and top-level types to compose descriptions.
• Basic datatypes: integers, reals, vectors, matrices, probability and string types for structured metadata.
• Linking & localization: unique identifiers, references, spatial and temporal localization for media segments.
• Basic description tools: language IDs, textual annotation, classification schemes, agent/place descriptions, ordering and relations.
• Content description tools:
  • Structure description: spatio‑temporal segmentation and segment attributes for video/audio/ink and mixed media.
  • Semantic description: entities, attributes and relations that capture “real‑world” semantics (objects, events, concepts).
• Content metadata: media format/encoding, creation & production metadata (title, creator, purpose), and usage (access rights, publication).
• Navigation & access: summarization, browsing views, partitions and content variations to support efficient retrieval.
• Content organization & user interaction: collections, models, user preferences and usage history.
• Normative syntax & semantics: all DS/D/DATATYPES are defined using DDL and include formal semantics; informative examples illustrate instantiation.

Practical applications and users

ISO/IEC 15938-5:2003 is for practitioners who need standardized, machine‑readable metadata for multimedia:

• Multimedia application developers (search, recommendation, playback) implementing MPEG‑7 metadata.
• Digital asset management & archives that require rich, structured descriptions for indexing and retrieval.
• Broadcasting and production houses tagging segments, versions and production metadata.
• Researchers in content‑based retrieval and semantic annotation using standardized descriptors and datatypes.
• Standards implementers and testers building conformance tools and reference software.

Benefits include interoperable metadata, precise segment localization, and a reusable library of description tools for consistent content discovery and rights/usage management.

Related standards

• ISO/IEC 15938 (MPEG‑7) Parts 1–4, 6–8 (Systems, DDL, Visual, Audio, Reference software, Conformance testing, Extraction/use).
• ISO/IEC 15938-2 for the Description Definition Language (DDL) used to define MDS elements.