信息技术.文件描述和处理语言.文件绘制系统规定的最低要求.第2部分:文件绘制系统格式规范

[中文适用范围]： 本部分 ISO/IEC 24754 提供了针对支持由 ISO/IEC 24754-1 描述的功能的文档呈现系统的格式化规范的编写指南。不存在针对这些指南的使用进行衡量的符合性约束。发布布局的可能用户需求是无限制的。用户有义务描述其需要通过文档呈现系统的开发人员或拼写员来满足的格式化要求。使用不完整的格式化规范可能会延迟实现所需的渲染结果。本部分 ISO/IEC 24754 是格式化规范编写者需要回答的问题清单。假设格式化规范的编写者不了解样式表编写者在满足规范编写者需求方面的需求。对于了解此类需求的编写者，本部分 ISO/IEC 24754 是一份有用的问题清单，需考虑这些问题。本部分 ISO/IEC 24754 概述了用户在分析其渲染预期时应评估的各种考虑因素。本部分 ISO/IEC 24754 描述的属性应足够详细地指定，以便开发人员或拼写员有必要的信息来利用文档呈现系统中的必要设施。本部分 ISO/IEC 24754 不假设任何特定的样式表语言来指定布局和格式化属性。各种样式表语言支持本文描述的不同程度的功能。并非所有语言都能假定提供对本部分 ISO/IEC 24754 描述的属性的控制，但用户仍有义务尽可能指定尽可能多的细节，以便为开发人员或拼写员的任务做好准备。了解布局的尽可能多的细微差别，就有更多的策略可以用来实现尽可能接近要求的布局。本部分 ISO/IEC 24754 的许多组件以第一人称以问题的形式向读者呈现，以便让读者在回答问题时反思自己的需求。 [外文原描述]： ISO/IEC TR 24754-2:2011 provides guidelines in the writing of formatting specifications targeted for document rendering systems supporting functionality described by ISO/IEC 24754-1. There is no scope of conformance constraints against which the use of these guidelines are measured. Possible user requirements for publishing layouts are unbounded. It is the user's obligation to describe their formatting requirements to be fulfilled by a developer or a compositor using a document rendering system. Using incomplete formatting specifications can delay achieving the desired rendered result. ISO/IEC TR 24754-2:2011 is a specification of questions for the writer of a formatting specification. It is assumed that the writer of a formatting specification is unaware of the needs of the stylesheet writer in meeting the needs of the specification writer. For a writer aware of such needs, ISO/IEC TR 24754-2:2011 is a useful checklist of the issues to be considered. ISO/IEC TR 24754-2:2011 outlines various considerations users should assess when analysing their rendering expectations. Properties described by ISO/IEC TR 24754-2:2011 should be specified in sufficient detail such that a developer or compositor has the information required to engage the necessary facilities in the document rendering system. ISO/IEC TR 24754-2:2011 does not presume any particular stylesheet language with which to specify layout and formatting properties. Various stylesheet languages support different degrees of functionality described herein. Not all languages can assume to offer control over the properties described by ISO/IEC TR 24754-2:2011, yet it behoves the user to specify as much detail as possible so as to equip the developer or compositor for their task. By knowing as many nuances of layout as desired, there are more strategies available with which to accomplish a layout as close as possible to the requirements. Many components of ISO/IEC TR 24754-2:2011 are presented to the reader as questions in the first person, so as to ask the reader to reflect on their requirements when answering the question.