//And apply the unifier to them
for (Iterator iter = templatePreconds.iterator(); iter
.hasNext();) {
PropositionImpl precond = (PropositionImpl) iter.next();
Literal literal = new LiteralImpl(precond);
literal.apply(un);
PropositionImpl concretePrecond = (PropositionImpl)propositionFactory.getProposition(literal.toString());
// XXX Uncomment the code to debug operator instantiation, it is removed to avoid wasting time here
// if(!concretePrecond.isGround()) {
// //throw new OperatorFactoryException("We have a non-concrete precond in operator "+signature+": "+concretePrecond);
// System.err.println("We have a non-concrete precond in operator "+signature+": "+concretePrecond);