[xquery-talk] Order of results in XQuery expressions

[Enric Jaen]

I am testing with Berkeley DBXML. I have to say that
in general the results follow a document order, but I
have noticed with some mixed-content documents a
non-deterministic order. But I have not been able to
determine a pattern when this occurs. Maybe is simply
an implementation bug.

For example, if I have a mixed document:
<foo>
 1 <1> 1 </1> 1
 2 <2> 2 </1> 2
 3 <3> 3 </3> 3
 4 <4> 4 </4> 4
</foo>

and I do  " foo/* " then I get this unexpected order:

<2>2</2>
<3>3</3>
<1>1</1>
<4>4</4>

even when I put ordered{ } 

But thanks, at least now I know that I should expect
a document order.

I have tried also with Saxon and I think it orders
well.

/Enric



--- Michael Kay <mike at saxonica.com> escribió:

> > <nitpick>
> > Though this is the way how all XQuery processors
> that I am 
> > aware of behave, it is not actually demanded by
> the specs.  
> > Rather, the default setting of `ordering mode' (if
> nothing is 
> > set in the query prolog) is implementation-defined
> (Sect. 
> > 4.7, XQuery 1.0 CR).
> > </nitpick>
> 
> Technically you are right (and I deliberately
> glossed over this point,
> because I thought it was unlikely to help the OP
> with his problem). The
> results of unordered evaluation of path expressions
> can be so weird that I
> don't think any processor would make this the
> default. For
> "implementation-defined" read "may be controlled
> using an
> implementation-defined API".
> 
> Michael Kay
> 
> _______________________________________________
> talk at x-query.com
> http://x-query.com/mailman/listinfo/talk
> 



		
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