[Os-project-managers] NaN in xs:double

[Jun Ma]

Gus,
Ya, just delete schema 1.5.
Let me know when you do that.
I will do the same for the schema web site.

in xxx:double  using xs or xsd are just people's convention name for the 
alias. as long as the alias is referring to http://www.w3.org/2001/XMLSchema
http://www.w3.org/2001/XMLSchema:double is built in w3c schema.

Looks like everybody agrees that NaN is a double, but in practical 
implementation, passing it to the solver is not good because solver may not 
be able to handle NaN well.
I do think in the schema NaN should be allowed, and it is up to our driver 
to specifically handle this value (along with many other special values).
For example, translating to a closest matched value acceptable by the solver 
is better than just catching/throwing the exception back to the solver .
Of course it would be the worst of not even catching it and feeding to the 
solver only to see the solver crash.
Jun

--------------------------------------------------
From: "Gus Gassmann" <Horand.Gassmann at dal.ca>
Sent: Wednesday, February 09, 2011 3:16 PM
To: "Horand Gassmann" <Horand.Gassmann at dal.ca>; "Kipp Martin" 
<kmartin at chicagobooth.edu>
Cc: <OS-project-managers at list.coin-or.org>
Subject: Re: [Os-project-managers] NaN in xs:double

> On 9 Feb 2011 at 11:42, Kipp Martin wrote:
>
>> Hi Gus:
>>
>> > two things:
>> >
>> > 1. Have a look at http://www.w3.org/TR/xmlschema-2/#double.
>> > This states quite clearly that NaN is a legal value for xs:double,
>>
>> But what about xsd:double -- is there an inconsistency. Does xsd:allow
>> for NaN?
>
> I can't find xsd:double anywhere. Isn't the part before the colon just a
> namespace that can be redefined arbitrarily? The way I understand it, we
> use xs: for the name space at www.w3.org/2001/XMLSchema, and we use
> the blank namespace for our stuff. I don't recall ever seeing another name
> space.
>
> Cheers
>
> gus
>
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