[Os-project-managers] More schema troubles!

[Kipp Martin]

Horand Gassmann wrote:
> Horand Gassmann <Horand.Gassmann at dal.ca> wrote:
> 
>> Kipp Martin <kmartin at chicagobooth.edu> wrote:
>>
>>> Hi Gus:
>>>
>>>> more trouble...
>>>>
>>>>  In OSoL we give the initial variable values in the form
>>>>
>>>> <var idx="..." value="..."/>
>>>>
>>>> where "value" is an *optional* attribute, with*out* a default value.
>>>> This makes very little sense. In OSrL we use the form
>>>>
>>>> <var idx="...">...</var>
>>>>
>>>> which is a little more sensible, but it does not allow us to compress
>>>> repeated values (such as for a zero-one program). I think we should use
>>>> the same form for both schemas, and we should at least allow the
>>>> possibility of an IntVector to compress repeated values. (Unfortunately,
>>>> this is a 3.0 issue...)
>>>>
>>>> Do you guys agree?
>>> I agree that:
>>>
>>> 1) we should be consistent,
>>>
>>> 2) allowing repeated values is good,
>>>
>>> 3) we are looking at OS 3.0
>>>
>>>
>>> That said, I am a little bit worried about our users such as the GAMS
>>> folks. We are going to break things for them.
> 
> Hi guys,
> 
> I do need some guidance as to what I should implement in the OSoL  
> parser. The current schema has
> 
> <var idx="..." value="..."/>
> 
> with *no* default value for the optional attribute "value". This is  
> not going to work. It is also inconsistent with OSrL, where the form is
> 
> <var idx="...">...</var>
> 
> The least amount of damage in the short run (i.e., prior to version  
> 3.0) would be to make the "value" attribute *required*. Are there any  
> objections to this change?

I do not object.

Thanks


> 
> Cheers
> 
> 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