quick xpath question

I have the following xml and I'm trying to the contents of the @doc
indicated:

I've tried //WorkFlow/Assembly/Station{(_at_)name="Label"}/WI[1]/@doc but I'm
clearly missing something...any help appreciated. I'm using the xpath with
some vb script to set the @doc contents as a string.

Thanks, Kathy

<?xml version="1.0"?>
<WorkFlow>
   <Assembly number="865-7446-03-SUB" rev="BA" workorder="" qty="">
     <Station name="Label">
        <WI order="1"
            title="Apply Labels"
            doc="10-ME40-865-7446-03-LB01.xml">      <!--TRYING TO GET THIS
FILENAME-->
               <Boards>
                  <!-- EX: <Board sn="" start="" finish="" user="" /-->
               </Boards>
        </WI>
     </Station>
     <Station name="Station1">
        <WI order="1"
            title="Work Instruction Test One"
            doc="KB_TEST_WI1.xml">
               <Boards />
        </WI>
        <WI order="2"
            title="Work Instruction Test Two"
            doc="KB_TEST_WI2.xml">
               <Boards />
     </Station>
   </Assembly>
</WorkFlow>


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