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{@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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