modify node type definition

[Marco Piovesana]

Hi all,
i have a running oak installation with custom node types defined in the
customCND file. What i want to do now is change the definition of one of
this node types.
I did set tu *true* the reregisterExisting property doing this:

CndImporter.registerNodeTypes(customCNDStream, session, true);

but of course the system complains, because the already existing nodes do
not comply with the new node type definition. How do i modify the existing
nodes before updating the customCND?

Marco.