// walk through children of this RDFTerm...
for(OperatorIDTuple<Operator> opIDTuple : this.getSucceedingOperators()) {
RDFTerm child = (RDFTerm) opIDTuple.getOperator(); // get current children
// create predicate panel...
PredicatePanel predicatePanel = new PredicatePanel(parent, this, child, this.prefix);
this.annotationLabels.put(child, predicatePanel);
// add predicate panel to hash table with its GraphWrapper...
predicates.put(new GraphWrapperOperator(child), predicatePanel);