The individual nodes for the items are contained inside the <xml> node (single item) or<object> node (multiple items). The content of these nodes depends on the type of objects returned and the structure of those objects in your schema.
Here is an example for an image object:
<image
nav:objectType="image"
id="obj28130"
name="41.twig with snow.jpg"
creationDate="2009-02-11T20:54:30.933Z"
modifiedDate="2010-01-14T23:30:24.260Z"
author="Laura Koval"
eventDate="2009-02-11Z"
pixWidth="410"
pixHeight="307"
...
<thumbnail
id="data2127" mime="image/jpeg" nav:mimeExt=".jpg"
nav:mimeMacType="JPEG" size="16634"/>
<preview
id="data2128" mime="image/jpeg" nav:mimeExt=".jpg"
nav:mimeMacType="JPEG" size="68049"/>
<data
id="data2129" mime="image/jpeg" nav:mimeExt=".jpg"
nav:mimeMacType="JPEG" size="138888"/>
</image>