How to get excerpt for child node?

[lujie]

Hi,
  I have such node structure:
  document
     --content
        --attachment
  if i want to get excerpt for attachment and at the sametime get the
document node,i 'm using
  //element(*,document)[jcr:contains(content/attachment,'test
content')]/rep:excerpt(.)
 but getting empty excerpt.
 Any ideas?

    regards,
                 lujie
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