This is also an example from Andrew May out of his tasks.zip, 

<target name="versionProduction">
  <pvcsversion repository="/pvcs/proj1"
               pvcsproject="/"
               label="release2"
               promotionGroup="Production"/>
</target>

In the ant-dev-mailing list you will find an  extension written by Andrew May for ANTS-optional PVCS-Task. His motivation, source-code and documentation can be found here: http://marc.theaimsgroup.com/?l=ant-dev&m=99667939904467&w=2