my $xpath = q!//Party[@id=//Relation[child::RelationRoleCode[@tc='37']
+]/@RelatedObjectID]/Producer/CarrierAppointment/CompanyProducerID!;
my @nodes = $root->findnodes($xpath);
for (@nodes){
  print $_->text;
}
[download]

OK, that seems to work... I think that was a big piece of the puzzle I was missing. I had not seen the Twig/Xpath module come up anywhere when I was googling.

Thank you!