Special attention To Alberto Re: SODA erratum 3 proposal

[BONNAREL FRANCOIS]

Hi all,
I agree that MIN with a 2D array doesn't make much sense and doesn't 
provide useful information.

For MAX  the 2D array could be enough for the maximum extent of the 
bounds as Pat says.

However, I am ready to go to the single value MIN/MAX and restricting 
the Erratum to a single clarification referencing VOTable 1.5 (can we do 
that ?). I think Dali-next  may be too far from recommendation to be  
referred.

BUt before doing that I would like Alberto's comment. he was the first 
one to point this issue a couple of years ago, when ESO was implementing 
SODA (a great success of this spec !!!)

Cheers
François

Le 14/02/2023 à 11:00, Mark Taylor a écrit :
> On Tue, 14 Feb 2023, Markus Demleitner wrote:
>
>> Hi Pat,
>>
>> On Mon, Feb 13, 2023 at 10:35:27AM -0800, Patrick Dowler wrote:
>>> I feel like the change in wording in WD-VOTable means that DALI (where
>>> xtype="interval" is defined) could (could have) defined min/max behaviour
>>> to be more like that pointed out by Adrian in the PyVO context. That is:
>>> use a 2D array value for MAX to specify the minimum bounding interval.
>> But why would want to introduce magic behaviour (over the standard
>> array interpretation) when we don't absolutely need to (which
>> arguably is the case when we do geometries as we ended up doing
>> them)?
>>
>>> So in my opinion MIN/MAX scalars like we already have, a MAX array (bounds)
>>> would work, WD-VOTable defers to the xtype-definition but seems to allow
>>> both (in principle), and DALI needs to be clarified.
>> True -- but I'd generally argue the fewer special rules the better.
>> Call it Occam's Editor :-)
> I agree, with what (I think) Markus is saying, and also what James
> said earlier: scalar MIN and MAX values applying to both elements
> of the interval seem like the least surprising semantics for those
> values to me.
>
> --
> Mark Taylor  Astronomical Programmer  Physics, Bristol University, UK
> m.b.taylor at bristol.ac.uk          http://www.star.bristol.ac.uk/~mbt/