[xquery-talk] problem with loops

[Michael Rys]

We so far raise an error in our XQuery implementation. I know it is
non-standard, but safer for our users, at least for now....

Best regards
Michael (another one :-))

> -----Original Message-----
> From: talk-bounces at xquery.com [mailto:talk-bounces at xquery.com] On
Behalf
> Of Michael Kay
> Sent: Wednesday, January 04, 2006 1:24 AM
> To: 'Martin Probst'; talk at xquery.com
> Subject: RE: [xquery-talk] problem with loops
> 
> 
> >
> > > declare function lcl:caller()
> > > {
> > >        let $QV1 := request:request-parameter("val1","")
> > >        let $count:= 0
> > >        let $QV1:= lcl:tracer($QV1)
> > >
> > > for $d in /maps/map
> > >        let $k:= lcl:rend($QV1)
> > >        let $QV2:= $QV1
> > >        let $QV1:= lcl:tracer($k)
> > >        return $QV2
> > > };
> >
> > Your problem is that $QV1 is not "overwritten", you can't re-declare
> > variables in XQuery. Meaning: the first $QV1 is a completely
different
> > variable than the second
> 
> Some of us argued long and hard that this should be a syntax error
(that
> is,
> that you should not be able to declare two variables with the same
name),
> but we lost the case unfortunately. It's a shame, because even in a
> language
> like Java that does allow variable assignments, using the same name
for
> two
> different variables is almost invariably a strong indicator of a
> programming
> error. We've become very familiar over the years with XSLT beginners
> attempting to write code like the above: in XSLT 1.0 this gives you a
> syntax
> error, but sadly in 2.0 this is no longer the case.
> 
> Michael Kay
> 
> 
> 
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