> p.s. Can anyone think of any other use for this element?

XSLT spec says:

NOTE: It may be necessary also to use aliases for namespaces other than
the XSLT namespace URI. For example, literal result elements belonging
to a namespace dealing with digital signatures might cause XSLT
stylesheets to be mishandled by general-purpose security software; using
an alias for the namespace would avoid the possibility of such
mishandling.

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