本标准采用ISO/IEC 19776 1:2015X，该标准定义了X3D中的抽象对象到使用可扩展标记语言的特定X3D编码的映射。每个XML编码的X3D文件（a）都支持X3D抽象规范中定义的X3D文件的所有用途，即ISO/IEC 19775；（b）以XML格式编码X3D构造。如ISO/IEC 19775所述，可扩展3D（X3D）定义了一个集成3D图形和多媒体的系统。从概念上讲，每个X3D文件都是一个基于3D时间的空间，其中包含可以通过各种机制动态修改的图形和听觉对象。 XML编码的X3D文件可以从使用其他X3D编码的文件中引用，其本身也可以引用使用其他X3D编码的其他X3D文件。这些文件只能由符合所有使用的X3D编码的浏览器处理。

This Standard adopts ISO/IEC 19776 1:2015X which defines a mapping of the abstract objects in X3D to a specific X3D encoding using the Extensible Markup Language. Each XML-encoded X3D file (a) supports all of the purposes of X3D files defined in the X3D abstract specification AS ISO/IEC 19775; and (b) encodes X3D constructs in an XML format. AS ISO/IEC 19775, Extensible 3D (X3D), defines a system that integrates 3D graphics and multimedia. Conceptually, each X3D file is a 3D time-based space that contains graphic and aural objects that can be dynamically modified through a variety of mechanisms. An XML-encoded X3D file may be referenced from files using other X3D encodings and may itself reference other X3D files encoded using other X3D encodings. Such files can only be processed by browsers that conform to all of the utilized X3D encodings.