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AS/NZS 4148:1994

AS/NZS 4148:1994

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Information technology – Hypermedia/Time-based structuring language (HyTime)

Published By Publication Date Number of Pages
AS 1994-04-18 139
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Defines a language and underlying model for the representation of 'hyperdocuments' that link and synchronize static and dynamic (time-based) information contained in multiple conventional and multimedia documents and information objects. The language is known as the 'Hypermedia/Time-based structuring language', or 'HyTime'. This Standard is identical with, and has been reproduced from, ISO/IEC 10744:1992.

Scope

This International Standard defines a language and underlying model for the representation of "hyperdocuments" that link and synchronize static and dynamic (time-based) information contained in multiple conventional and multimedia documents and information objects. The language is known as the "Hypermedia/Time-based Structuring Language", or "HyTime".
HyTime can represent time in both the abstract, or "musical" sense, and in user-definedreal-time units. It also provides a way of relating the two so that elements of time-dependent documents can be synchronized.
NOTE 5 This facility extends to the representation of multimedia information the power, once limited to conventional documents, to distinguish intrinsic information content from style considerations.
HyTime's techniquesfor representing its time model are equally applicableto spatial and other domains; all are treated as systems for measuring along different axes of a coordinate space. Arbitrary cross-references and access paths based on external interactions ("hypermedia links") are also supported.
HyTime's time representation contains sufficient information to derive the durations of both control ("gestural") data (e.g., control information for audio or video hardware) and visual data (e.g., a music score, presentation storyboard, or television script).
The media formats and data notations of objects in a HyTime hyperdocument can include formatted and unformatted documents, audio and video segments, still images, and object-oriented graphics, among others. Users can specify the positions and extents of occurrences of objects in space and time, using a variety of measurement units and granularities. Temporal requirements of applications ranging from animation to project management can be supported by choosing appropriate measurement granules.
NOTE 6 This International Standard does not address the representation of audio or video content data, but simply defines the means by which the start-time and duration of such data can be synchronized with other digitized information. Nor does it specify the layout process by which occurrences of unformatted documents and other information objects can be made to fit the positions and extents specified for them.
HyTime is an enabling standard, not an encompassing one. As a result, the objects comprising a HyTime hyperdocument are free to conform to any application architectures, or to document architectures imposed by standards, and to be represented in any notation permitted by those architectures. Only the "hub document", which determines the hyperdocument membership, must conform to HyTime in addition to any other architectures to which it may conform.
HyTime is designed for flexibility and extensibility. Optional subsets can be implemented, alone or in conjunction with user-defined extensions.
The Hypermedia/Time-based Structuring Language (HyTime) is an SGML application conforming to International Standard ISO 8879 – Standard Generalized Markup Language.
The hyperdocument interchange format recommended in this International Standard is ISO 9069, the SGML Document Interchange Format (SDIF). SDIF is defined in Abstract Syntax Notation 1 (ISO 8824) and can be encoded according to the basic encoding rules of ISO 8825 for interchange using protocols conforming to the Open Systems Interconnection (OSI) model. Other interchange formats can also be used.

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AS/NZS 4148:1994
$66.95