Built-in type should return null for getBaseType()

When calling getBaseType() on a built in type, it should return null.
Currently it seems to be returning itself.

This would allow code like that below to work.

public static TypeDefinition getRootType(final TypeDefinition typeDef) {
assert typeDef != null;

TypeDefinition t = typeDef;

while (t.getBaseType() != null)

{ t = t.getBaseType(); }
return t;
}

currently I need to do :

public static TypeDefinition getRootType(final TypeDefinition typeDef) {
assert typeDef != null;

TypeDefinition t = typeDef;

while ((t.getBaseType() != null) && (!t.getQName().getLocalName().equals(t.getBaseType().getQName().getLocalName()))) { t = t.getBaseType(); }

return t;
}