// TODO if insertion into data editor or into an existing
// TripleContainer, then all existing items (of the
// TripleContainer
// or from the whole DataEditor) must be first inserted!
final ASTGroupConstraint node = SPARQL1_1Parser.parseGroupGraphPatternsAndRDFTerms(content);
for (int i = 0; i < node.jjtGetNumChildren(); i++) {
final Node child = node.jjtGetChild(i);
if (child instanceof ASTGroupConstraint) {
final VisualQueryGenerator vqg = new VisualQueryGenerator(
((VisualGraphOperatorWithPrefix) this.visualGraphs
.get(0)).prefix);