HyTime

HyTime (Hypermedia/Time-based Structuring Language) is a markup language that is an "application" of SGML. HyTime defines a set of hypertext-oriented element types that, in effect, supplement SGML and allow SGML document authors to build hypertext and multimedia presentations in a standardized way.

HyTime is an international standard published by the ISO and IEC. The first edition was published in 1992, and the second edition was published in 1997.

Legacy

Some of the concepts formalized in HyTime were later incorporated into HTML and XML:

• HTML is an application of SGML for hypertext document presentations, that assigns specific semantics and processing expectations to a fixed set of element types.
• XML defines a simplified subset of SGML that focuses on providing an open vocabulary of element types for data modeling and establishes precise expectations for how the marked-up data is read and subsequently fed to another software application for further processing, but does not assign semantics to the element types or establish expectations for how the data is processed.

Standard

The HyTime standard itself is ISO 10744, available from the International Organization for Standardization.

Further reading

• Steven DeRose and David Durand, "Making Hypermedia Work: A User's Guide to HyTime," Kluwer Academic Publishers 1994 (ISBN 0-7923-9432-1).

External links

• Robin Cover's HyTime resource list
• ISO/IEC 10744 Amendment 1 - an amendment to ISO/IEC 10744:1997 Annex A.3
• Standards: HyTime: A standard for structured hypermedia interchange by Charles Goldfarb, from IEEE Computer magazine, vol. 24, iss. 8 (Aug. 1991), pp. 81–84
• A Brief History of the Development of SMDL and HyTime