[Exist-open] Xpath, XMLDB, and eXist

[<ba...@dc...>]

I don't know if this is the best list to ask it, but as i am using eXist, i
will try ...

I have some XML documents that are newspaper notices.

The structure is:

<notices>
  <notice>
      <author>...</author>
      <title>
      	     <paragraph>
	       <sencence>...</sentence>
	       <sencence>...</sentence>
	       ....
	     </paragraph>
      </title>
      <content>
      	     <paragraph>
	       <sencence>...</sentence>
	       <sencence>...</sentence>
	       ....
	     </paragraph>
	     ...
      </content>
  </notice>
    ...
</notices>


I need to get the sentences that contains the word house:

/notices/notice//sencence[. &= 'house']

But i need to obtain the author of the notice where the sentence is
included.

I have seen eXist returns exist:id attribute in the result items, but i
don't know how to query the author using this information. 

As i have said, i am using XMLDB API to access eXist.

Any suggestions?

  Mario Barcala