$scratch/> open 1.xml
parsing 1.xml
done.
                                                                                                                                                                                                                                                                                  /> ls //Party

Found 0 node(s).
                                                                                                                                                                                                                                                                                  /> register-namespace l http://ACORD.org/Standards/Life/2
                                                                                                                                                                                                                                                                                  /> count //l:Party
3

/> ls //Party[@id=//Relation[child::RelationRoleCode[@tc='37']]/@RelatedObjectID]/Producer/CarrierAppointment/CompanyProducerID

Found 0 node(s).

/> ls //l:Party[@id=//l:Relation[child::l:RelationRoleCode[@tc='37']]/@RelatedObjectID]/l:Producer/l:CarrierAppointment/l:CompanyProducerID
<CompanyProducerID>459JQ</CompanyProducerID>

Found 1 node(s).