Retrive the entire path from the leaf node

Hi All,

I have a xml like :

<?xml version="1.0" encoding="UTF-8"?>
<CPOs xmlns:fn="link1" xmlnss="link2">
<CPO type="topinfo" timed="no">
<field name="dataprovider" />
<field name="description"/>
<field name="entry">
<field name="user"/>
<field name="machine"/>
<field name="shot"/>
<field name="run"/>
</field>
<field name="parent_entry">
<field name="user"/>
<field name="before_leaf">
<field name="user1"/>
<field name="machine2"/>
<field name="shot1"/>
<field name="run1"/>
</field>
<field name="machine"/>
<field name="shot"/>
<field name="run"/>
</field>

</CPO>
</CPOs>

I have to retrieve the data as ;

topinfo.dataprovider
topinfo.entry.user
topinfo.parent_entry.before_leaf.user1

Using XSLT.
Can anybody please help me to solve this.

Thanks in Advance

ananda121