本标准定义了lid:统一资源标识符（URI），并描述了如何使用它来识别通过单向方式（如电视广播）传输的资源实例，如网页和图形文件。

This standard defines the lid: uniform resource identifier (URI), and describes how it is used to identify instances of resources, such as web pages and graphic files, that are transmitted through unidirectional means, such as a television broadcast.