This can be cumbersome to maintain, and it can be more difficult to perform appropriate error checking (see the section, "Trap for errors") and to avoid unnecessary lookups.
这些代码维护起来会很麻烦,而为避免不必要的查找以及执行适当的错误检查就更加困难(参见“捕获错误”部分)。
While you can often add a required element to avoid the UPA error, the content introduced into instances is often meaningless or forces an unnatural ordering of the data.
尽管通常可以添加一个必需的元素来避免upa错误,但是引入到实例中的内容往往是无意义的,或者让数据失去自然的排序。
In 2.0, XSL: choose can only avoid raising errors when all branches have no static error.
在2.0中,xsl: choose只能避免当所有分支都没有静态错误时引发错误。
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