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Re: XML Redux

• From: "Pete Cordell" <petexmldev@codalogic.com>
• To: "Andrew Welch" <andrew.j.welch@gmail.com>
• Date: Thu, 17 Feb 2011 14:58:11 -0000

Original Message From: "Andrew Welch"
> I think I'm missing the point, but if not consider the xpath:
>
> if ('0') then 'aa' else 'bb'
>
> vs
>
> if (xs:integer('0')) then 'aa' else 'bb'
>
> The output of the former is aa, the latter bb, because of the
> different type of '0' and the way that type is converted to a boolean.

So the motivation is to allow xpath programmers to be lazy at the expense of 
the message format more verbose and harder to generate?

Interestingly the equivalent Perl program (see below) generates 'bb' in both 
cases.

#!/usr/bin/perl

if( "0" ) {
 print "aa\n";
} else {
 print "bb\n";
}
if( 0 ) {
 print "aa\n";
} else {
 print "bb\n";
}


Pete Cordell
Codalogic Ltd
Interface XML to C++ the easy way using C++ XML
data binding to convert XSD schemas to C++ classes.
Visit http://codalogic.com/lmx/ or http://www.xml2cpp.com
for more info
----- Original Message ----- 
From: "Andrew Welch" <andrew.j.welch@gmail.com>
To: "Pete Cordell" <petexmldev@codalogic.com>
Cc: "Dave Pawson" <davep@dpawson.co.uk>; <xml-dev@l...>
Sent: Thursday, February 17, 2011 2:33 PM
Subject: Re:  XML Redux



On 17 February 2011 13:50, Pete Cordell <petexmldev@codalogic.com> wrote:
> Original Message From: "Dave Pawson"
>
>> Semantics?
>>
>> Its a number... as apposed to a string?
>> The sender recipient should understand it as 32 somethings,
>> the app only knows it can treat it as a number?
>
> But is that level of semantics helpful to a computer? I'm not sure that
> knowing that something is 32 the number, rather than "32" the string would
> help me much with all the semantic inferencing I can do as a human. I 
> would
> have thought its even less useful to a computer!

I think I'm missing the point, but if not consider the xpath:

if ('0') then 'aa' else 'bb'

vs

if (xs:integer('0')) then 'aa' else 'bb'

The output of the former is aa, the latter bb, because of the
different type of '0' and the way that type is converted to a boolean.



-- 
Andrew Welch
http://andrewjwelch.com

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• References:
  • XML Redux
    • From: Liam R E Quin <liam@w3.org>
  • Re: XML Redux
    • From: Michael Kay <mike@saxonica.com>
  • Re: XML Redux
    • From: John Cowan <cowan@mercury.ccil.org>
  • Re: XML Redux
    • From: "Pete Cordell" <petexmldev@codalogic.com>
  • Re: XML Redux
    • From: Dave Pawson <davep@dpawson.co.uk>
  • Re: XML Redux
    • From: "Pete Cordell" <petexmldev@codalogic.com>
  • Re: XML Redux
    • From: Andrew Welch <andrew.j.welch@gmail.com>