Parsing XML Response

Good morning.  I have an XML response that has the following structure:

111

  222 (1->M)

     333 (1->M)

     333

     333

  222

     333

     333

........

I need to parse the response XML, query each child element (both 2's and 3's) and for matches on certain criteria pipe that into a subsequent test case SOAP request (which has 1-M on the 2's and 3's).

What is the best way to accomplish that?

Thanks!