Load Navigation Set and dump to comment
<mvt:item name="readytheme" param="Load_NavigationSet('navigation_all-categories', g.testnav )" />
<mvt:assign name="g.var" value="miva_array_serialize(g.testnav)" />
<!-- @@ &mvt:global:var; -->
<mvt:item name="readytheme" param="Load_NavigationSet('navigation_all-categories', g.cattree )" />
<mvt:assign name="l.settings:cattree_structure" value="g.cattree" />
<mvt:foreach iterator="cattree_item" array="cattree_structure:navigationitems">
&mvt:cattree_item:name;
<mvt:foreach iterator="cattree_item_level2" array="cattree_item:items">
&mvt:cattree_item_level2:name;
</mvt:foreach>
</mvt:foreach>