目标名字域为XML方案文件及其域扩展定义了独一的标识符。
The target namespace defines the unique identifier for the XML schema file and its domain extension.
URI 通常用作 XML 核心规范中的系统标识符，指定引用自某个 XML 文档中的具体资源，例如一个文件。
URIs are generally used in XML core specifications as system identifiers, which specify a concrete resource, such as a file, referenced from an XML document.
在创建中介策略以为每个服务加载一个不同的 xsl 文件（从而对每个服务使用一个不同的标识符）后可以看到这些值。
These will be seen later when a mediation policy is created to load a different xsl file for each of the services, thus allowing a different identifier for each service.
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