// ==== Do it
for ( int i = 0 ; i < cl.getNumPositional() ; i++ )
{
String exprStr = cl.getPositionalArg(i) ;
exprStr = cl.indirect(exprStr) ;
try {
PrefixMapping pmap = PrefixMapping.Factory.create() ;
pmap.setNsPrefixes(ARQConstants.getGlobalPrefixMap()) ;
pmap.setNsPrefix("", "http://example/") ;