sru_service.xml http://localhost:9763/search.pz2?command=init&service=sru
http://localhost:9763/search.pz2?session=1&command=search&query=computer
-1 http://localhost:9763/search.pz2?session=1&command=show
+w http://localhost:9763/search.pz2?session=1&command=show