Just for reference as to how I did this, in case anyone is interested:
Code:
<thing id="wpBEAxe" name="Axe" description="Rarity C" compset="Melee" summary="Rarity C">
<fieldval field="grCost" value="200"/>
<fieldval field="gearWeight" value="2"/>
<usesource source="BrEarth"/>
<tag group="WeaponType" tag="MedAxes"/>
<tag group="WeaponDie" tag="3" name="d6" abbrev="d6"/>
<eval phase="PreTraits" priority="5000" index="2"><![CDATA[if (hero.tagis[Edge.edgAxeFig] <> 0) then
perform hero.child[wpBEAxe].setfocus
focus.field[wpParry].value += 1
endif]]></eval>
</thing>