| Hello, 
 Maybe there is some mistake in your name of your containment feature, and I had the similar trouble. Or maybe there is mistake in your .ecore model, something like the wrong relationship among the classes.
 
 > From: gmf-dev-request@xxxxxxxxxxx
 > Subject: gmf-dev Digest, Vol 48, Issue 1
 > To: gmf-dev@xxxxxxxxxxx
 > Date: Thu, 30 Apr 2009 12:00:38 -0400
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 > 1. help (Sihem CHABCHOUB)
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 > ----------------------------------------------------------------------
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 > Message: 1
 > Date: Wed, 29 Apr 2009 22:13:10 +0200
 > From: Sihem CHABCHOUB <sihem.chabchoub@xxxxxxxxx>
 > Subject: [gmf-dev] help
 > To: gmf-dev@xxxxxxxxxxx
 > Message-ID:
 > <69875aee0904291313s590696bcqdd0d950d048b9c15@xxxxxxxxxxxxxx>
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 >
 > Hello,
 >
 > I have extract "UML.ecore" from the plugin and I add meta-classes in this
 > file.Then I validate successufully the mapping file but when I'm creating
 > generator model I find validation error like this:"Top level node
 > 'Containment feature' must be available in the diagram 'Domain Element' or
 > its super-class".
 >
 > After that I have tried the same example with "UML.ecore" from the
 > plugin directly and I haven't found this error.
 >
 > I need to know so if it's possible to do heavy extension to the
 > UML.ecore????
 > And if it is possible, how can I correct this error?
 >
 > Thanks a lot.
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