[xsl] XML tags as map keys and impact on XSLT/XPath

[Wolfgang Laun <wolfgang.laun@xxxxxxxxx>]

Every now and then, people (not me) want to represent a Map<K,V> in XML by using
s.th. like
   <map>
     <k1>v1</k1>
     <k2>v2</k2>
     ...
   </map>
with ki from K and vi from V. Apart from the obvious limitation for K's values,
I feel that this is somehow violating the spirit of XML. But this is not a list
for XML, and I don't want to risk a red or yellow card.

So, more specifically: Doesn't such a "structure" complicate the writing
of XSLT constructs? Aren't there any statements or expressions that
won't be usable at all? (I don't need an exhaustive list of what isn't
possible - I'm more interested in a general judgment.)

Thanks
-W