I wrote

  / is an operator on node sets in Xpath, if $tag and $subtag are nodeset
  valued  variables, then $tag/$subtag is a legal operation (and always
  equivalent to $subtag unles $tag is empty) otherwise it is an error.


Which is, as Ken pointed out, an error. You can't use a variable directly
on the right hand side of /.

In my defence I'll point out that the above is true (I think) in Xpath
2 draft.

David

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