Overview
ISO 8879:1986/Amd 1:1988 is Amendment 1 to ISO 8879:1986 - the international standard for the Standard Generalized Markup Language (SGML). Published by ISO in 1988, this amendment enhances the technical content of the original SGML standard to clarify parsing, attribute handling, linking, error reporting and delimiter recognition without changing SGML’s fundamental design. It lists corrections, clarifying notes and resolved ambiguities by page and clause, with principal clauses affected including 4, 7, 9, 10, 11, 12, and 15.
Key Topics
- Entity parsing and active types: Clarifies that entities may be parsed with respect to the base document type, active document types, and active link types (clauses 4.2, 4.3, 7.1, 12.1.1).
- Data attributes and tokenization: Data attributes (notation parameters) use the same syntax as other attributes; tokenized attribute values remove extraneous spaces (7.9.3, 7.9.4).
- Link syntax and nesting: Link syntax now expressly allows element nesting and references to general entities within links (12.1.4, 12.2, 12.3; 9.4.4, 10.4.2).
- Tag omission rules and priorities: Conditions where start-tag omission is ambiguous are clarified; SHORTTAG and DATATAG have priority over OMITTAG (7.3.1.1, 7.3.2, 7.4.1.1).
- Data entities: CDATA and SDATA are specified as data entities (like NDATA) and treated consistently when referenced (4.75.1, 7.9.4.3, 10.5.3, 10.5.5).
- General entity name lists: General entity name attributes are lists (7.9.4, 11.3.3) and entity declaration applicability is clarified.
- Delimiter recognition: General rules for delimiter recognition modified to avoid conflicts with existing exceptions (9.6 series, Figure 3).
- Error reporting and system declarations: Potential error conditions may be reported (15.4), and system declaration text is enhanced (15.6).
Applications and Practical Value
- Implementers of SGML parsers and processors use this amendment to ensure correct parsing semantics, attribute tokenization and link handling.
- DTD authors and document architects rely on clarified tag-omission and mixed-content rules to design robust document type definitions.
- Publishers, documentation teams and archival systems maintaining legacy SGML workflows use the amendment to fix ambiguous behaviors and improve interoperability.
- Tool vendors (editors, validators, converters) use the clarified delimiter and entity rules to reduce implementation inconsistencies and runtime errors.
Who Should Use This Standard
- SGML implementers and software developers
- DTD and markup language designers
- Technical publishers, archives and organizations with legacy SGML content
- Standards bodies and digital preservation specialists
Related Standards
- ISO 8879:1986 (original SGML standard)
- Later markup languages and specifications influenced by SGML (for historic and migration context)
Keywords: ISO 8879:1986/Amd 1:1988, SGML Amendment 1, Standard Generalized Markup Language, entity parsing, data attributes, tag omission, delimiter recognition, general entity name list.
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