Primitive types in the ivoa package

[Gerard Lemson]

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?

Cheers
Gerard


> Laurent
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