Overview
ISO/IEC TR 20943-3:2004 is an international technical report developed by ISO and IEC to support best practices in metadata management. This standard provides detailed procedures for the consistent registration of value domains and their attributes within metadata registries, specifically in accordance with ISO/IEC 11179. Reliable value domain management is critical for ensuring high-quality metadata, supporting data interoperability, and improving data sharing across organizational and information system boundaries.
The technical report acts as a user's guide rather than a data entry manual, focusing on the conceptualization and consistent establishment of value domains. Organizations can adapt and supplement these guidelines to meet their specific requirements. The scope is limited to the procedures and principles involved in defining, registering, and managing value domains, conceptual domains, and their interrelations within metadata registries.
Key Topics
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Value Domains: A value domain is a defined set of permissible values for a data element. These could include lists of codes (enumerated) or values defined by a rule (non-enumerated).
- Enumerated value domains: All permissible values are listed explicitly (e.g., code sets, standard classifications).
- Non-enumerated value domains: Permissible values are defined by rules (e.g., number intervals, character strings).
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Conceptual Domains: Represent sets of value meanings. Value domains are instantiations of these sets, directly associating values and their explicit meanings.
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Registration Procedures: The standard outlines how to consistently register value domains, emphasizing clarity, reusability, and semantic integrity.
- Choosing appropriate codes
- Managing changes or additions (versioning)
- Associating value domains with data elements and conceptual domains
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Relationships and Equivalences:
- Elementarily equivalent domains: Value domains with one-to-one correspondence between values and meanings.
- Conceptually equivalent domains: Different value domains representing the same set of meanings.
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Code Sets and Classification Schemes: Standardized code lists and structured classification schemes can be registered and reused as value domains, enhancing interoperability.
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Semantic Restrictions: Some value domains are inherently limited by their meanings, restricting their applicability to certain data elements.
Applications
Implementing the procedures in ISO/IEC TR 20943-3:2004 brings practical benefits to organizations involved in metadata management, data governance, and information system development:
- Data Interoperability: By consistently registering value domains, organizations facilitate seamless data sharing and integration across diverse systems.
- Metadata Quality: Standardized value domain registration ensures meaningful, comparable, and high-quality metadata, reducing ambiguities.
- Reusability: Well-defined value domains support efficient reuse across different projects, avoiding redundant metadata creation.
- Support for Regulatory Compliance: Adhering to international standards simplifies reporting and compliance with data-related regulations requiring high metadata quality.
- Interorganizational Collaboration: Establishing common, conceptually equivalent value domains enables cooperation among government agencies, businesses, and research institutions.
Related Standards
For a comprehensive metadata registry implementation, ISO/IEC TR 20943-3:2004 should be considered alongside the following related standards:
- ISO/IEC 11179 (Parts 1-6): The foundational series for metadata registries, covering frameworks, classification, metamodels, data definitions, naming principles, and registration methods.
- Other Parts of ISO/IEC 20943:
- Part 1: Data elements
- Under development: Part 2 (XML structured data), Part 4 (Overview)
- ISO/IEC 5218: Standard for representation of human sexes, providing an example of standardized value domains.
- ISO/IEC 5215, 4217: Examples of code set standards for other data categories, applicable as value domains.
By aligning metadata practices with ISO/IEC TR 20943-3:2004, organizations enhance the consistency, utility, and interoperability of their metadata registries, ensuring lasting value in data management initiatives.