Rails - Jul 2007 - Nested RESTful Routes and creating a object from XML

I am trying to create a new model from XML that contains has a has_many
relationship.  Is this possible without having to write code to parse
the XML or to doing multiple POSTS?  I can do a post with XML that
doesn''t contain any of the has_many elements and it works fine.  It is
when I add the items from the has_many relationship that I get a bunch
of errors.

Here are the examples I am trying

This works...
<manual-track>
  <color>orange</color>
  <comment>This is track 3</comment>
  <rfi-event-id>RFI 3</rfi-event-id>
  <submitter>Joe</submitter>
</manual-track>

This doesn''t
<manual-track>
  <color>orange</color>
  <comment>This is track 3</comment>
  <rfi-event-id>RFI 3</rfi-event-id>
  <submitter>Blow</submitter>
  <positions>
    <position>
      <lat type="float">20.0</lat>
      <lon type="float">25.0</lon>
    </position>
    <position>
      <lat type="float">30.0</lat>
      <lon type="float">35.0</lon>
    </position>
  </positions>
</manual-track>

Error from cURL about ActiveRecord::AssociationTypeMismatch in Manual
tracksController#create

this fails too...
<manual-track>
  <color>orange</color>
  <comment>This is track 3</comment>
  <rfi-event-id>RFI 3</rfi-event-id>
  <submitter>Blow</submitter>
  <position>
    <lat type="float">20.0</lat>
    <lon type="float">25.0</lon>
  </position>
  <position>
    <lat type="float">30.0</lat>
    <lon type="float">35.0</lon>
  </position>
</manual-track>

NoMethodError in Manual tracksController#create
  undefined method `position='' for
#&lt;ManualTrack:0x47ec8dc&gt;

Any suggestions of what I need to do?
Thanks!
CW
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