The meaning of the carried over elements may not have changed and so a namespace change may seem improper.
继续保留的元素含义可能不会改变，因此改变名称空间似乎是不妥的。
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。
The elements that need not be changed during the migration are
迁移过程中不需要更改的元素有
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