p:insert and matching nothing

in section 7.1.11 p:insert

it states
----------------------------

The value of the match option must be an XSLTMatchPattern. It is a
dynamic error (err:XC0023) if that pattern matches anything other than
element nodes. Multiple matches are allowed, in which case multiple
copies of the insertion document will occur.

-----------------------------

we might want to tighten things ups, e.g. what happens when we match
nothing ? is this an error ?

cheers, Jim Fuller