Partial validation in RelaxNG?

[Gustaf Liljegren <gustaf.liljegren@xml.se>]

A short question about RelaxNG: is it possible to have partial validation?
I mean something like:

<element name="whatever">
  <any/>  <!-- any well-formed XML markup -->
</element>

I've searched through the spec and tutorial, but can't find anything about
this. Is there any particular reason why RelaxNG should *not* have this
feature?

Gustaf