RE: [xsl] ancestor axis order

[David.Pawson@xxxxxxxxxxx]

    As has been commented it depends if you are assuming things 
    about your input that you didn't state, but in general this 
    doesn't fully answer your request (and neither did the 
    version I posted, they both made (slightly different assumptions)
    
    For example the above doesn't test that the nearest (choice 
    or define) ancestor is a choice, which is, I think what you asked.

It is indeed.

    It would be true on
    
    define
      choice
        define
          ref

Which would be wrong for my use-case.    
    
    perhaps the most direct way of saying 
       nearest (choice or define) ancestor is a choice
    
    would be
    
     ancestor::*[self::define or self::choice][1][self::choice]
                                                        ^^^^^^^
Shouldn't that be self::define?

More assumptions.
   choice may(or may not) be in position 1, i.e. parent of the current node,
no, wait one,
DC isn't wrong enough times (except in his typing). 
The or condition latches onto the first (ancestor) choice,
then 'requires' there be a choice nearer the document root.
   Neat David, neat :-)
   Math logic always makes me smile!

Since I now know that choice is never an ancestor of define,
as David Rosenborg pointed out, the simpler 
<xsl:when test="ancestor::rng:choice"> is sufficient.


And now, adding DC logic, i.e. knowing that 
  a) I will always have a define as an ancestor,
  b) Some form of Karnaugh probably reduces [self::choice][1][self::define]
to ancestor::choice.

Thanks David.

regards DaveP



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