[xsl] Excluding Namespaces from the Result Tree

["Heiko Niemann kontakt@xxxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

using XSLT 2.0 there is the value #all for the attribute
exclude-result-prefixes. I try to find cases where you would NOT want to
use it, in other words why would you want to keep namespaces in the result
tree that are not used there? Which leads to the question why cleaning up
namespaces is not a default behavior.

Thanks for your hints,
Heiko