Primitive types in the ivoa package

[Laurent MICHEL]

Gerard,


Le 18/05/2020 à 13:02, Gerard Lemson a écrit :
> HI Laurent
>> Helo DM,
>>
>> I'm working on CAB-MSD and Modelio warns me against the use of
>> ivoa:Quantity as attribute types because it is not declared as primitive.
>>
>>      For the record: ivoa:Quantity and sub-types attach a unit
>>                      to a numerical value.
>>
>> This means that I've to build an explicit composition relationship from my class
>> to ivoa:Quantity if I want to use it which is rather ugly.
>>
>> Is there is strong justification for this feature?
>>
> I don't really understand what the problem is.
> In VO-DML, Attributes can (only) be assigned ValueType-s (as opposed to ObjectType-s).
> In VO-DML these are concretely (ValueType itself is abstract) represented by PrimitiveType, Enumeration and DataType.
> ivoa:Quantity is a DataType and can thus be assigned to an Attribute.
> Am I missing something?

This is what I believed, but Modelio complains (see joined screenshot) 
because RealQuantity is not tagged as primitive. If I do it, the pb goes 
away.
This is may be just an issue related to the Modelio profile I'm using.

Laurent
> 
> Cheers
> Gerard
> 
> 
>> Laurent
>> --
>> ---- English version:
>>        https://www.deepl.com/
>>
>> ---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37
>>        Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32
>>        11 Rue de l'Universite      Mail laurent.michel at astro.unistra.fr
>>        67000 Strasbourg (France)   Web  http://astro.u-strasbg.fr/~michel
>> ---
> 

-- 
---- English version:
      https://www.deepl.com/

---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37
      Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32
      11 Rue de l'Universite      Mail laurent.michel at astro.unistra.fr
      67000 Strasbourg (France)   Web  http://astro.u-strasbg.fr/~michel
---
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