Get it, makes sense, thanks 
Sent from my dish washer 

  On 22 Aug 2024, at 14:49, Alan Painter alan.painter@xxxxxxxxx
  <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

  o;?The table that Martin pointed out from the specification indicates
  that it is in order of "lowest to highest", hence '=>' (line 16) has
  higher precedence than '=' (line 5).
  On Thu, Aug 22, 2024, 14:43 Leo Studer leo.studer@xxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
  wrote:

      Does https://www.w3.org/TR/xpath-31/#id-precedence-order
      help?

    Not really, I would expect 
    A = B => not()   and  (A=B) => not()
    To be the same since = precedes =>

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