void addPackage(PackageBinding element) {
knownPackages.put(element.compoundName[element.compoundName.length - 1], element);
}
void addType(ReferenceBinding element) {
if (knownTypes == null)
knownTypes = new HashtableOfType(25);
knownTypes.put(element.compoundName[element.compoundName.length - 1], element);
}