}
// collect relationship classes
for (final SchemaRelationship schemaRelationship : StructrApp.getInstance().relationshipQuery(SchemaRelationship.class).getAsList()) {
nodeExtender.addClass(schemaRelationship.getClassName(), schemaRelationship.getSource(errorBuffer));
final String auxSource = schemaRelationship.getAuxiliarySource();
if (auxSource != null) {
nodeExtender.addClass("_" + schemaRelationship.getClassName() + "Helper", auxSource);