Most tools I know of only support the latter (2001) namespace form, which may be why the W3C decided to go back to it, but they did sow a bit of confusion with this namespace change and reversal.

据我了解，多数工具只支持后一种(2001)名称空间形式，这可能是W3C决定回到原来的名称空间的原因，但这种名称空间的变化和撤销确实带来了一些混乱。

youdao

This paper tries to conduct an in-depth analysis to interpret why rural migrant worker's children have geographical identity confusion, and lack of geographical sense of belonging to city.

本文针对打工子弟中学生地域身份认同混乱、地域归属感缺失的问题，试图进行深入的原因分析。

youdao

But given this simplicity, why do we have such confusion about how to actually do it?

FORBES: Explaining the Greek Debt Crisis

It is thus a perfect moment to consider how the DSM came about in the first place and why this new edition will do nothing to clear up the public's growing confusion.

WSJ: DSM-5: A Manual Run Amok