Value of the variable set with x:set , is [attribute_name=attribute_value] instead of just attribute_value

Hello, 
   
  I searched everywhere for a solution, but couldn't find an answer to this scenario:
   
  If I output the value of the attribute l_id as follows, the correct output - attribute's value - is being displayed
  <x:out select="$transformed/Products/Product[1]/@l_id"/>
   
  However, If I try the following, the value of attribute l_id is being printed as [l_id="some_value"] instead of just some_value
   
  <x:set var="key" select="$transformed/Products/Product[1]/@l_id" />
<c:out value="${key}"/>
   
  How do I make only the xml node's attribute value be stored in the variable while using x:set ?
   
   
   

 		
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