how to filter elements in XPath

[Enric Jaen]

Hi,
Is there any way to filter the child elements of a given Xpath expression? 
(without using multiple paths)

For example, having this:

<AAA>
  <BBB/>
  <CCC/>
  <DDD/>
</AAA>

I'd like to return AAA with only BBB and CCC elements, like this:

<AAA>
  <BBB/>
  <CCC/>
</AAA>


Regards,
-Enric