wo [hl7:observation [hl7:code [concat(@code,@codeSystem)=doc('include/voc-1.2.40.0.34.10.44-DYNAMIC.xml')//valueSet [1]/conceptList/concept/concat(@code,@codeSystem) or @nullFlavor=doc('include/voc-1.2.40.0.34.10.44-DYNAMIC.xml')//valueSet [1]/conceptList/exception/@code]]]