attainGoal,what is it?

[Zheng Wen Zhe]

Hi,
what does this attainGoal do within the code below?
 
 <goal  name="nightly">
        <attainGoal name="jar:install"/>
        <attainGoal name="war"/>
        <attainGoal name="ear"/>
  </goal>
************************
Is there any article I could refer to?

Thanks,
Jason

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