[xquery-talk] Implementation practices regarding ordering
G. Ken Holman
gkholman at CraneSoftwrights.com
Mon Mar 16 08:30:49 PST 2009
In my post earlier to Howard regarding his requirement for preserving
document order, I talked about the difference between:
<library>
{
for $each in library/book
order by $each/@pubYear descending
return $each
}
</library>
... and ...
declare ordering ordered;
<library>
{
for $each in library/book
stable order by $each/@pubYear descending
return $each
}
</library>
... where the second is portable across all implementations and the
first only when the implementation-defined values for ordering in
both the separate default mode and FLWOR expression are implemented as ordered.
I'm starting my 5-day hands-on XQuery/XSLT class this morning in
Prague in advance of the http://XMLPrague.cz conference, and I would
like to tell students about implementation practices. I'm running
the same class in the Los Angeles area June 8-12.
Which of the publicly-announced implementations of XQuery do not
assume document order when using location path addresses to get nodes
from the source node tree?
Thanks for sharing!
. . . . . . . . . . . Ken
--
XQuery/XSLT/XSL-FO training in Los Angeles (New dates!) 2009-06-08
Training tools: Comprehensive interactive XSLT/XPath 1.0/2.0 video
Video lesson: http://www.youtube.com/watch?v=PrNjJCh7Ppg&fmt=18
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G. Ken Holman mailto:gkholman at CraneSoftwrights.com
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