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。

youdao

They no longer violate UPA when conflicting with explicitly specified elements, they can exclude a list of namespaces or a list of names, and they can even be defaulted.

当与明确指定的元素冲突时，它们不再违背UPA，它们可以排除一组名称空间或一组名称，甚至可以设置默认通配符。

youdao

This avoids the UPA problem.

这避免了UPA问题。

youdao

The Universal Powerline Association (UPA) is an International not-for-profit trade association working to promote global standards and regulations in the fast developing Powerline communications market.

ENGADGET: UPA and HomeGrid Forum agree to support G.hn networking standard

The NDA, as well as a UPA government minus the Left, are likely to push through disinvestment of state-owned companies.

FORBES: Indian Elections

Both of these scenarios would prolong the UPA's time in office at the cost of significantly reducing Congress's chances of getting re-elected in the next national polls.

ECONOMIST: Exit polls point to a narrow BJP victory in Gujarat