Oracle 10 listener and XDB

When I start the oracle 10 listener it shows an XDB service running.
 
I don't want it running and I am sure in previous versions I just
removed the entry from listener.ora.
 
However I see no XDB service in the listener.ora or tnsnames.ora files
 
 
Is this working differently in Oracle 10?  How do I stop XDB?
 
 
John 

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