automatic parent versioning
---------------------------

         Key: MNG-624
         URL: http://jira.codehaus.org/browse/MNG-624
     Project: Maven 2
        Type: Improvement
 Reporter: Brett Porter
     Fix For: 2.0-beta-1


(this may be bumped to 2.1 or even made WON't FIX as it is contentious - see 
MNG-521)

currently, you have to specify the parent version when extending which makes a 
project stand alone very easily, but has the drawback of being a maintainance 
problem when you start development on a new version. Tools can help, but it 
would be nice not to have to rely on them.

One alternative is to allow the parent version to be omitted, and when it is it 
is assumed you want the latest. The parent is used from the reactor or the 
universal source directory. IT may also be read from a LATEST in the repository 
though this is contentious - it may be better to simply fail in that 
environment and require builds be in a known checkout structure for building 
individual projects.

This also introduces the need for tool support to populate the version on 
release and deployment for reproducibility.

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