[Xdoclet-user] How to merge into a pre-existing ejb-jar.xml file?

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Hi,
I'm trying to add env-entries in specific beans of my pre-existing ejb-jar.xml.
But using the mergedir, either my ejb-jar.xml is deleted when force=true, 
or nothing is added when force=false.
Is there a way to do a really merge operation?
Thanks
Xavier