Xpath to generate an xpath string to the current item

An xpath to be used in either xquery or XSLT to generate the heirarchical path to the current item

string-join(
   (for $node in ancestor::* 
    return 
      concat($node/name(),
              '[', 
              count($node/preceding-sibling::*[name() = $node/name()])+1, 
              ']'
            ),
      concat(name(),
              '[', 
              count(preceding-sibling::*[name() = current()/name()]) + 1, 
              ']'
            )
    ),
  '/')