reversing element ordering, with a caveat

[Howard Katz]

Beautiful. I just removed the value() function following the path ending in
@pubYear, as Saxon returned an "Unknown system function," and it worked
perfectly.
 
Thanks you,
Howard


  _____  

From: http://x-query.com/mailman/listinfo/talk [mailto:http://x-query.com/mailman/listinfo/talk] On Behalf
Of Brian Maso
Sent: Sunday, March 15, 2009 7:24 PM
To: Howard Katz; http://x-query.com/mailman/listinfo/talk
Subject: Re:  reversing element ordering, with a caveat


In XQuery, I think its just a matter of running over the distinct values of
//book/@pubYear in descending order. Something like:

(* Maybe there's a more elegant way of getting the sequence of years in
descending order? *)
let $descending-distinct-years := distinct-values(for $v in
//book/@pubYear/value() order by $v descending return $v)
for $year in $descending-distinct-years
return //book[@pubYear = $year]

This will retain original document ordering for elements with the same
@pubYear value, but years will be descending from highest value to lowest.

Brian Maso


On Sun, Mar 15, 2009 at 6:04 PM, Howard Katz <http://x-query.com/mailman/listinfo/talk> wrote:


I have a series of books ordered chronologically by publication date, 1942
to 2009. I want to generate a file in which the books have the reverse
chronological ordering, 2009 to 1942, but with the caveat that books
*within* a particular year need to maintain the original document order
relative to that year. In the following, the catid attributes within a
particular year remain in ascending order after the transformation.  (The
catid's are used here only for demonstration purposes; they're not present
in the actual document.)

I'd be happy to see a solution either in XQuery or in XSLT. Here's some
sample input and the output.

Input:

<library>
       <book pubYear='1942' catid='1' >
               <otherStuff ... /></book>
       <book pubYear='1942' catid='2' >
               <otherStuff ... /></book>
       <book pubYear='1942' catid=' 3 ' >
               <otherStuff ... /></book>
       ...

       <book pubYear='2009' catid=' 2011' >
               <otherStuff ... /></book>
       <book pubYear='2009' catid=' 2012 ' >
               <otherStuff ... /></book>
       <book pubYear='2009' catid=' 2013 ' >
               <otherStuff ... /></book>
</library>

Output:

<library>
       <book pubYear='2009' catid=' 2011' >
               <otherStuff ... /></book>
       <book pubYear='2009' catid=' 2012 ' >
               <otherStuff ... /></book>
       <book pubYear='2009' catid=' 2013 ' >
               <otherStuff ... /></book>
       ...

       <book pubYear='1942' catid=' 1 ' >
               <otherStuff ... /></book>
       <book pubYear='1942' catid=' 2 ' >
               <otherStuff ... /></book>
       <book pubYear='1942' catid=' 3 ' >
               <otherStuff ... /></book>
</library>

TIA,
Howard

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