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http://jira.codehaus.org/browse/MNG-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Bentmann closed MNG-4421.
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       Resolution: Fixed
    Fix Version/s: 3.0-alpha-3
         Assignee: Benjamin Bentmann

Added warnings in 
[r831579|http://svn.apache.org/viewvc?view=revision&revision=831579].

> Warn regarding old-style references when used in a project build
> ----------------------------------------------------------------
>
>                 Key: MNG-4421
>                 URL: http://jira.codehaus.org/browse/MNG-4421
>             Project: Maven 2
>          Issue Type: Improvement
>          Components: Inheritance and Interpolation, Reactor and workspace
>    Affects Versions: 3.0-alpha-2
>            Reporter: Paul Benedict
>            Assignee: Benjamin Bentmann
>             Fix For: 3.0-alpha-3
>
>
> I was reading the Introduction to the POM page. It says:
> > These variables are all referenced by the prefix "project.".
> > You may also see references with pom. as the prefix, or the
> > prefix omitted entirely - these forms are now deprecated and
> > should not be used.
> Jason van Zyl says:
> {quote}For backward compat they will remain during 3.0. We should collapse 
> them in 3.1.{quote}
> Brian Fox says:
> {quote}Yeah deprecated in 3.x. However we'll always have to support them when 
> resolving things from the repo since that's cast in stone for projects 
> already released. We should not support them for projects being built with 
> 3.x though.{quote}
> Paul Merlin has suggested giving them warnings to facilitate their dis-use.
> The summary is: 
> (a) 3.0 should warn about the old-style references
> (b) The references must remain interpolated when present in poms drawn from 
> the repositories
> (c) 3.1 should prevent their use in project builds

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