PREFIX     :    <http://example/> 
PREFIX jext:    <java:arq.examples.propertyfunction.>
PREFIX  xsd:    <http://www.w3.org/2001/XMLSchema#>

SELECT ?p ?localname
{
   ?x ?p ?v .
   ?p jext:localname ?localname .
   ?p jext:localname ?localname .   # This is a check now (all bound)
}