ISO/IEC 9541-1:2012

Overview

ISO/IEC 9541-1:2012 - Information technology - Font information interchange - Part 1: Architecture - defines the architectural framework for exchanging font resources. The standard specifies the structure and required properties of a font resource, including font description, font metrics, glyph description and glyph metrics, and establishes a method of naming glyphs and glyph collections that is independent of document encoding. The 2012 second edition modernized the syntax to XML (DSDL, ISO/IEC 19757-2) and consolidates several earlier amendments and corrigenda.

Key topics and requirements

• Glyph naming independent of document encoding
  • A method for naming individual glyphs and glyph collections so fonts can be referenced and interchanged regardless of the document character encoding used.
• Font resource architecture
  • Defines the conceptual components a font resource must expose: font description, glyph descriptions, font and glyph metrics, and related properties needed for consistent rendering and interchange.
• Metrics and descriptive properties
  • Specifies required metric information (e.g., baseline, advance, bounding metrics) and descriptive properties to support layout, rendering, and font substitution decisions.
• Interchange syntax update
  • Editorial conversion from older SGML/DTD and ASN.1 representations to XML using DSDL (ISO/IEC 19757-2) to support modern toolchains and parsing.
• Assumptions for mapping encodings
  • The standard assumes text processing systems will provide one or more methods to associate document encodings with the glyph identifiers defined in the font resource.

Applications

• Font vendors and foundries: produce font files and metadata that comply with a consistent interchange architecture.
• Software developers: implement font handling, rendering engines, and layout systems that map document encodings to glyph identifiers and use standardized metrics for accurate text layout.
• Digital publishing and typesetting: ensure predictable font substitution, embedding and cross-platform appearance when exchanging documents and font resources.
• Archiving and font repositories: catalog and preserve font metadata and glyph collections in a standardized, encoding-independent way.

Who should use this standard

• Font format designers and implementers
• Text rendering and layout engine developers
• Digital publishers, typesetters, and desktop publishing vendors
• Archivists and repositories managing font assets

Related standards

• ISO/IEC 9541 (other parts in the font information interchange family)
• ISO/IEC 19757-2 (DSDL - the XML schema technology referenced for syntax)
• Historical formats referenced: SGML/DTD and ASN.1 (superseded by XML in this edition)

Keywords: ISO/IEC 9541-1, font information interchange, font architecture, glyph naming, font metrics, XML DSDL, font resource, glyph collections.