I order to be able to unregister a nodeType (mgnl:content), we have to unregister at the same time all nodeTypes referencing this nodeType.

• nodeType defining mgnl:content as super type
• nodeType defining mgnl:content as child node type.

This has to be recursive. For example
NTA
NTB super NTA
NTC super NTB
In this case, NTB and NTC has to be identified as when NTB will be unregistered, NTC depending on NTB has also to be unregistered.

This is done by the following method:

AbstractNodeTypeRegistrationTaskç#getDependentNodeTypes(
who is using a jackrabbit implementation.