{
String exprStr = cl.getPositionalArg(i) ;
exprStr = cl.indirect(exprStr) ;
try {
PrefixMapping pmap = PrefixMapping.Factory.create() ;
pmap.setNsPrefixes(ARQConstants.getGlobalPrefixMap()) ;
pmap.setNsPrefix("", "http://example/") ;
pmap.setNsPrefix("ex", "http://example/ns#") ;
// Node n = asNode() ;
// return makeNode(n) ;
Expr expr = ExprUtils.parse(exprStr, pmap) ;
if ( verbose )