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RE: RE: XQuery subset (was RE: WXS acronym?)

• To: "Jonathan Robie" <jonathan.robie@d...>,"Simon St.Laurent" <simonstl@s...>
• Subject: RE: RE: XQuery subset (was RE: WXS acronym?)
• From: "Dare Obasanjo" <dareo@m...>
• Date: Fri, 16 Aug 2002 13:59:44 -0700
• Cc: <xml-dev@l...>
• Thread-index: AcJFZx7DB/JlBoHGRtOxJYh1Lu0FTQAAByog
• Thread-topic: RE: XQuery subset (was RE: WXS acronym?)

> -----Original Message-----
> From: Jonathan Robie 
> [mailto:jonathan.robie@d...] 
> Sent: Friday, August 16, 2002 1:54 PM
> To: Dare Obasanjo; Simon St.Laurent
> Cc: xml-dev@l...
> Subject: RE:  RE: XQuery subset (was RE:  
> WXS acronym?)
>
> >It also has interesting type issues like what happens when I do this
> >
> >function is-integer(xs:decimal $d) returns xs:boolean{
> >   $d instance of xs:integer
> >}
> >
> >   is-integer(xs:integer(6661))
> >
> >Does the query return true or false? Both answers have unpleasant
> >ramifications.
> 
> The function conversion rules say that the integer is converted to a 
> decimal, so it returns false.

So function parameters are not polymorphic for numeric types? So if I
have a simpletype called myns:shoesize then 

	function is-integer(xs:decimal $d) returns xs:boolean{
	   $d instance of xs:shoesize
	}

   is-integer(myns:shoesize(11))

returns false? I'd love to explain that to our users. 

So are other types treated polymorphically (e.g. string types, complex
types) or do function conversion rules only discriminate against the
numeric types?

-- 
PITHY WORDS OF WISDOM 
Blessed are the meek for they shall inherit the Earth, minus 40%
inheritance tax.     

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rights. 

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