信息技术 超媒体/时基结构化语言(HyTime

[中文适用范围]： 范围定义 本国际标准定义了一种用于表示“超级文档”的语言和底层模型，该“超级文档”链接和同步多个传统和多媒体文档和信息对象中包含的静态和动态（基于时间的）信息。 该语言被称为“超媒体/基于时间的结构化语言”，或“HyTime”。 HyTime 可以表示抽象或“音乐”意义上的时间，也可以表示用户定义的实时单位。 它还提供了一种将两者关联起来的方法，以便可以同步时间相关文档的元素。 注7：该功能将曾经限制于传统文档的多媒体信息的表示能力扩展到区分内在信息内容和风格考虑的能力。 HyTime 表示其时间模型的技术同样适用于空间和其他领域；所有这些都被视为沿着坐标空间的不同轴进行测量的系统。 还支持基于外部交互（“超媒体链接”）的任意交叉引用和访问路径。 HyTime 的时间表示包含足够的信息来导出控制（“手势”）数据（例如，音频或视频硬件的控制信息）和视觉数据（例如，乐谱、演示故事板或电视脚本）的持续时间。 HyTime 超文档中对象的媒体格式和数据符号可以包括格式化和未格式化的文档、音频和视频片段、静止图像和面向对象的图形等。 用户可以使用各种测量单位和粒度来指定对象在空间和时间中出现的位置和大小。 通过选择适当的测量粒度，可以支持从动画到项目管理等应用程序的时间要求。 注8：本国际标准不涉及音频或视频内容数据的表示，而只是定义了此类数据的开始时间和持续时间可以与其他数字化信息同步的方法。 它也没有指定布局过程，通过该过程可以使未格式化的文档和其他信息对象的出现适应为它们指定的位置和大小。 HyTime 是一项支持性标准，而非包罗万象的标准。 因此，构成 HyTime 超文档的对象可以自由地遵守任何应用程序架构或标准规定的文档架构，并以这些架构允许的任何符号表示。 除了可能符合的任何其他体系结构之外，只有可能确定超文档成员资格的“中心文档”必须符合 HyTime。 HyTime 的设计具有灵活性和可扩展性。 可选子集可以单独实现，也可以与用户一起实现。 超媒体/基于时间的结构化语言 (HyTime) 是符合国际标准 ISO 8879 — 标准通用标记语言的 SGML 应用程序。 该国际标准推荐的超文档交换格式是 ISO 9069，即 SGML 文档交换格式 (SDIF) ). SDIF 在抽象语法表示法 1 (ISO/IEC 8824) 中定义，可以根据 ISO/IEC 8825 的基本编码规则进行编码，以便使用符合开放系统互连 (OSI) 模型的协议进行交换。 其他交换格式可以2 应用领域 HyTime 的应用领域是“集成开放超媒体”（IOH），超链接的“书目模型”，其中作者可以通过适当的参考，在任何时间、任何地点链接到任何内容。 。 由于 HyTime 的模块化设计和灵活的一致性规则，实施只需要支持那些在其现有能力范围内的设施。 尽管如此，由于完整的超媒体解决方案具有明确的向上兼容路径，因此鼓励用户对超文档准备进行投资。 H [外文原描述]： 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 “Hypermedimime-based Structuring Language”, or “HyTime”. HyTime can represent time in both the abstract, or “musical” sense, and in user-defined real-time units. It also provides a way of relating the two so that elements of time-dependent documents can be synchronized. NOTE 7 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 techniques for representing its time model are equally applicable to 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 sizes 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 8 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 sizes 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 may determine the hyperdocument membership, must conform PO 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 IS0 8879 - Standard Generalized Markup Language. The hyperdocument interchange format recommended in this International Standard is IS0 9069, the SGML Document Interchange Format (SDIF). SDIF is defined in Abstract Syntax Notation 1 (ISO/IEC 8824) and can be encoded according to the basic encoding rules of ISOAEC 8825 for interchange using protocols conforming to the Open Systems Interconnection (OSI) model. Other interchange formats can also be used.