I have a simple XML file
<Config new="Y" >
<schema_path value="/var/tmp/sh.xsd"/>
<collection name="new" >
<unit-list>
<Instance active="Y" unit_type="xp" unit_name="table"/>
</unit-list>
</collection>
</Config>
I'd like to instert a new element Instance into xml in unit-list
<Instance active="N" unit_type="linux" unit_name="door" />
How to do it ?