[Os-project-managers] Interpretation question about OSoL

[Jun Ma]

Gus,
Did some technical research:
The type xsd:double represents an IEEE double-precision 64-bit 
floating-point number. The format of xsd:double values is a mantissa.
an empty value is not valid, unless xsi:nil is used.

So, our parser should give error msg.
Although, what's surprising is that my xml spy does  <obj idx="-2" 
lbValue="">, though in my opinion, it should give a validation error too.

Jun

--------------------------------------------------
From: "Kipp Martin" <kmartin at chicagobooth.edu>
Sent: Friday, December 31, 2010 5:25 AM
To: "Horand Gassmann" <Horand.Gassmann at dal.ca>
Cc: <Os-project-managers at list.coin-or.org>
Subject: Re: [Os-project-managers] Interpretation question about OSoL

> Hi Gus:
>>
>> I am working through the fine points of the parser implementation and
>> have a question about interpretation.
>>
>> What should happen in each of the following two cases?
>>
>> <initialObjectiveBounds numberOfObj="2">
>>      <obj idx="-1">
>>      <obj idx="-2" lbValue="">
>> </initialObjectiveBounds>
>>
>> I think in the first case the lower bound should be -INF (the default
>> value), but I am not sure about the second. Should it be flagged as an
>> error? Or should it be OSNAN?
>
> I think an error. I think with high probability, that if there is an
> lbValue="", then the user actually MEANT for a value to be there and
> should be made aware of the fact (by an error) that it is empty.
>
> Cheers
>
>
>>
>> The reason why I am asking is that I have gotten into the habit of
>> parsing attributes that occur more than once using a common code, and
>> there are other occasions when lbValue is returned as a string, not a
>> double as is the case here. As a result, I would have to recognize
>> this case separately.
>>
>> Any opinions?
>>
>> Thanks
>>
>> gus
>>
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>
>
> -- 
> Kipp Martin
> Professor of Operations Research
> and Computing Technology
> Booth School of Business
> University of Chicago
> 5807 South Woodlawn Avenue
> Chicago, IL 60637
> 773-702-7456
> kmartin at chicagobooth.edu
> http://www.chicagobooth.edu/faculty/bio.aspx?person_id=12825325568
> http://projects.coin-or.org/OS
>
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