Robert Scholte created MPLUGIN-350:
--------------------------------------

             Summary: Split @Parameter into @Input and @Output
                 Key: MPLUGIN-350
                 URL: https://issues.apache.org/jira/browse/MPLUGIN-350
             Project: Maven Plugin Tools
          Issue Type: New Feature
            Reporter: Robert Scholte


By knowing if parameters are input or output parameters, it is possible to 
improve our builds. It will be possible to create DAGs and chain the execution 
blocks much smarter.
The Maven Extension created by Gradle heavily relies on this kind of 
information.

It is probably easier to use new annotations instead of adding a (required) 
status-field to @Parameter
Looking at the {{plugin.xml}} it looks quite easy to solve this and stay 
backwards compatible: the file looks now like:

{code:xml}
  <parameters>
    <parameter>
      ...
    </parameter>
  </parameters>
{code}

With plexus-magic the following should still work:
{code:xml}
  <parameters>
    <input>
      ...
    </input>
    <output>
      ...
    </output>
  </parameters>
{code}



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