goals within goal ?

[Zheng Wen Zhe]

Hi,
below is a piece of code to set up a goal.
My question: what's <goals="nightly"> means? Is 'nightly' some other goal?

thanks,
jason
********************************************************************
<goal   name="build"  prereqs="cvs-checkout"
    description="generate the site for the entire project">
    <attainGoal name="newVersion"/>
    <maven:reactor
      basedir="${basedir}/target/build"
      postProcessing="true"
      includes="*/project.xml"
      goals="nightly"
      banner="Generating site"
      ignoreFailures="false"/>

  </goal>

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