ISO/IEC 9541-2:2012

Overview

ISO/IEC 9541-2:2012 - Information technology - Font information interchange - Part 2: Interchange format - defines standardized interchange formats and the minimum subsets of font information required to exchange font resources reliably between systems. Part 2 is part of the ISO/IEC 9541 family that specifies the architecture of font resources and how font references can be constructed for electronic document interchange. The 2012 second edition modernizes the format syntax to XML-based DSDL and specifies the format using the RELAX NG Compact Syntax (ISO/IEC 19757-2) parsing framework.

Key topics and requirements

• Interchange format specification
  • Defines how font resource information must be encoded for consistent interchange across information processing systems.
• Minimum font subsets
  • Establishes the minimum set of font properties that an ISO font resource must contain to support interoperable exchange; implementations are expected to support more properties for richer processing.
• Dependency on Part 1
  • Requires the property definitions and architectural concepts given in ISO/IEC 9541-1 (font resource architecture).
• Use of RELAX NG Compact Syntax
  • Specifies font resource formats in RELAX NG Compact Syntax (ISO/IEC 19757-2) so font resources can be validated and parsed consistently in supporting environments.
• Backward and editorial changes
  • The second edition cancels and replaces the 1991 edition and incorporates prior amendments and corrigenda; it includes an editorial change from earlier SGML/DTD and ASN.1 syntaxes to XML (DSDL).

Applications and who uses it

ISO/IEC 9541-2:2012 is practical for organizations and professionals that need reliable, portable font information exchange across platforms and document systems:

• Software vendors developing font management, typesetting, desktop publishing, or document rendering engines
• Document processing and office-suite integrators who need consistent font referencing for interchange
• Digital publishers and print service providers ensuring font fidelity across workflows
• Digital archivists and repositories managing standardized font resources for long-term preservation
• Standards implementers and QA teams validating font resource files using RELAX NG-based parsers

Adopting ISO/IEC 9541-2:2012 helps reduce font substitution errors, improves cross-system compatibility, and supports robust electronic document interchange where font fidelity matters.

Related standards

• ISO/IEC 9541-1 - Font resource architecture and property definitions (required by Part 2)
• ISO/IEC 19757-2 - RELAX NG Compact Syntax (used to specify the interchange schema)
• Historical: ISO/IEC 9541-2:1991 and subsequent amendments/corrigenda incorporated into the 2012 edition

Keywords: ISO/IEC 9541-2:2012, font information interchange, interchange format, RELAX NG Compact Syntax, font resources, font subsets, ISO font resources.