proper package structure to implement JMI interfaces

Hi,

I want to implement following JMI interface generated from MDR:

library/diagraminterchange/diagram.java

according to guidance on web page http://mdr.netbeans.org/custom_implementations.html  I tried with following package structure

library/diagraminterchange/diagramImpl.java
and
javax/jmi/impl/library/diagraminterchange/diagramImpl.java

both don't work, what should be the proper package structure to implement my JMI interfaces?

Thanks & regards!

Bin