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[XQuery] MS-XQ-LC1-065

From: Michael Rys <mrys@microsoft.com>
Date: Mon, 16 Feb 2004 03:06:13 -0800
Message-ID: <EB0A327048144442AFB15FCE18DC96C7020A31D8@RED-MSG-31.redmond.corp.microsoft.com>
To: <public-qt-comments@w3.org>

Section 3.2.2 Predicates	
Technical	

The current dispatch rules for predicates is problematic since one often
has to defer to runtime whether an index or an effective Boolean value
is calculated, even if one does static type inferencing, and since
float/double imprecision can lead to unexpected/wrong results. 

Instead of doing position and fn:boolean() do the following for E[$x]:
 
if $x instance of xs:decimal=> do position as described (note no
float/double due to precision issues), 
if $x instance of node()* then fn:boolean($x), 
if instance of xs:boolean then $x, 
otherwise type error (may also add xs:string as an option).
Received on Monday, 16 February 2004 06:06:23 UTC

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