Betternestedset talk - May 2008 - xml result filtering

in followup to my last email regarding how to use result_to_xml, i was able
to do so, with this syntax:

<%=Match.result_to_xml match.full_set%>

Now, i am wondering how to filter out some of the nodes within my xml. I
only need the id of the match object, not the updated-at and created-at
values that match model includes.

I don''t want this:

<match>
    <created-at
type="datetime">2008-05-23T16:33:46-06:00</created-at>
 <id type="integer">369</id>
    <updated-at
type="datetime">2008-05-23T16:33:46-06:00</updated-at>
    <children>
    </children>
  </match>

I want this:

<match>
 <id type="integer">369</id>
    <children>
    </children>
  </match>



Does this makes sense? i want to trim down my xml result object so that the
object is light weight to go across the wire.


thanks,

jerad
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