ISO/IEC 29341-4-4:2011（E）定义了AV数据结构模板（AVDT）XML文档的布局。AVDT文件描述了UPnP AV规范中使用的各种数据结构的格式要求和限制。其目的是使每个设备能够（在运行时）描述这些AV数据结构的特定变化。AVDT文件允许AV数据结构（例如UPnP控制点）的用户减少符合服务规范但与设备特定功能不兼容的数据结构实例的数量。AVDT文档的最终目标是减少因控制点创建超出设备静态（已知）能力的数据结构实例而导致的错误情况。不幸的是，AVDT机制永远不会消除所有可预防的错误情况，但它将通过向客户端提供有关设备特定功能的更多信息来帮助减少这些情况。 本国际标准取代2008年出版的ISO/IEC 29341-4-4第一版，并构成技术修订版。

ISO/IEC 29341-4-4:2011(E) defines the layout of the AV Datastructure Template (AVDT) XML document. An AVDT document describes the format requirements and restrictions of various data structures used within the UPnP AV specifications. Its purpose is to enable each device to describe (at run-time) its particular variation of these AV data structures. AVDT documents allow users of AV data structures (e.g. UPnP control points) to reduce the number of instances of those data structures that comply with the service specification but are not compatible with the device's particular capabilities. The ultimate goal of an AVDT document is to reduce those error conditions that are caused by control points creating instances of a data structure that exceed the static (known) capabilities of the device. Unfortunately, the AVDT mechanism will never eliminate all preventable error conditions, but it will help to reduce them by giving the client more information about the device's particular capabilities. This International Standard replaces ISO/IEC 29341-4-4, first edition, published in 2008, and constitutes a technical revision.