I don't know about you...

...but that looks awful strange and smells like a big hack.

And it is really broken for XSLT/XPath where you expect to match on 'student' or 'teacher'.

What we want is:

<t:district xmlns:t='...'>
<t:student id=''>...</t:student>
<t:teacher>...</t:teacher>
</t:district>

without changing the content model of 'district'!!!