Virtual Processor Identifier 现在引入虚拟处理器标识符
A real-world application might use the notation identifier to locate the appropriate content processor and use the entity's system identifier as its input.
实际的应用程序可能会使用符号标识符来定位适当的内容处理程序并使用实体的系统标识符作为其输入。
A 1.0 processor can accept a 2.0 stylesheet because the namespace URI (Universal Resource Identifier) for XSLT elements has not changed for 2.0; only the (mandatory) version number has changed.
处理程序能够接受2.0样式表是因为XSLT元素的名称空间uri(统一资源描述符)没有变，只有(必须的)版本号变了。
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