root of archive
   \---META-INF
     |   eclipselink-dbws.xml -- service descriptor file
     |   eclipselink-dbws-sessions.xml -- name can be overriden by <sessions-file> entry in eclipselink-dbws.xml
     |   eclipselink-dbws-or.xml -- EclipseLink mapping file
     |   eclipselink-dbws-ox.xml -- EclipseLink mapping file
     |   eclipselink-dbws-schema.xsd -- XML schema definition file - when deployed in a .war file, located in a different directory