[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Why not reinvent the wheel?
On Thu, Mar 01, 2001 at 12:08:13PM -0500, Jonathan Robie wrote: > Would an operator that indicates that order is irrelevant satisfy your wish > here? Absolutely! I think such an "unorder" operator was proposed in "A Formal Data Model and Algebra for XML" by David Beech, Ashok Malhotra and Michael Rys, in 1999. The query processor could propagate the "not-ordered" property to the inputs of the unorder operator (so we would only need to mention unorder only once in a typical database-oriented query). An unordered join would also be associative (right?), and that would turn XML query optimization back into the exponential problem we know and love :-) Regards, Vassilis Papadimos.
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