}
public static void registerSubstitutionGroupElements(QName substitutionGroup, QNameSet substitutions) {
QNameSet oldSubstitutions = (QNameSet) substitutionGroups.get(substitutionGroup);
if (oldSubstitutions != null) {
substitutions = oldSubstitutions.union(substitutions);
}
substitutionGroups.put(substitutionGroup, substitutions);
}
public static void unregisterSubstitutionGroupElements(QName substitutionGroup, QNameSet substitutions) {