I need an XPath expression which returns true if the string in <A> is between 1 and 10 characters in length, and false otherwise.

For example, the XPath expression should return true on this XML:

<A>hi</A>

Here's an inefficient XPath expression:

(string-length(.) gt 0) and (string-length(.) le 10)

It's inefficient because it computes the string length twice.

Is there a more efficient XPath expression to solve this problem?

  let $l := string-length()
  return ($l gt 0 and $l le 10)