本文件的结构如下。第2-4条规定了整个文件中使用的术语、缩写、符号和惯例。条款5-11包含由15938-3标准化的描述工具的定义，按它们相关联的视觉特征分组，从条款5中的基本结构和容器开始，到条款10中的颜色、纹理、形状、运动、定位。第11条包含其余的非机密项目。每个描述工具由以下子条款描述:？语法:Ds或DSs的规范DDL规范。？二进制语法:Ds或DSs的规范二进制表示。？语义:对应D或DS的所有组成部分的语义的规范定义。

The structure of this document is as follows. Clauses 2-4 specify the terms, abbreviations, symbols and conventions used throughout the document. Clauses 5-11 contain definitions of the description tools standardized by 15938-3 grouped by the visual
features they are associated with, starting with basic structures and containers in Clause 5, through color, texture, shape, motion, localization in Clause 10. Clause 11 contains the remaining, unclassified items.

Each description tool is described by the following subclauses:

？ Syntax: Normative DDL specification of the Ds or DSs.

？ Binary Syntax: Normative binary representation of the Ds or DSs.

？ Semantic: Normative definition of the semantics of all the components of the corresponding D or DS.