VOUnit for solar density or metallicity?

[Molinaro, Marco]

Hi Semantics,

I also agree with Markus' view.

Can I ask something that might derail the topic a bit?

Would it be that bad to have controlled units lists
alongside the VOUnit REC, using an approach similar
to ADQL-UDF or SAMP-MTypes or ... i.e. non normative
but shared within specific communities?

I think solar physics could be a case, but other
specific domains might benefit.

Goal would be: clients aware of these might use them,
unaware clients/researchers will just skip by.

I suppose all of these should go within the 'unknown'
§2.11 quoted ones.

Pro:
- common units outside the normative VOUnits can be
used with some more meaning
- VOunits can be kept clean of domain specific, even
if widely used, solutions

Cons:
- extra parsing step for those who want to interpret
them (remove quote, go on parsing)
- extra controlled lists maintenance
- (a sentence in VOUnits - §2.8? -)

Cheers
    Marco

Il giorno mar 31 mag 2022 alle ore 19:24 Patrick Dowler <
pdowler.cadc at gmail.com> ha scritto:

> I agree with Markus' last argument. This makes it 100% clear to me
>
> --
> Patrick Dowler
> Canadian Astronomy Data Centre
> Victoria, BC, Canada
>
>
> On Mon, 30 May 2022 at 04:20, Markus Demleitner <
> msdemlei at ari.uni-heidelberg.de> wrote:
>
>> Hi Tom,
>>
>> On Fri, May 27, 2022 at 05:35:54PM +0000, Tom Donaldson wrote:
>> > Based on the discussion so far I’m disinclined to try to introduce
>> > a change in astropy to support Sun, although as a data provider it
>> > may still be the best option for us for a handful of columns.  As
>> > Markus said, it is unlikely to be handled automatically by a
>> > client.  I don’t see a way for astropy to map it to a concrete
>> > unit, but I suppose it could be of limited use to a human.
>>
>> Ah, let's keep machine-readable info in machine-readable fields (like
>> unit) and let's have human-readable info in human-readable fields
>> (which would be description in this case).  I submit
>>
>>   unit: <empty>
>>   description: Angular momentum relative to the sun
>>
>> even for humans is preferable to
>>
>>   unit: Sun
>>   description: Angular momentum
>>
>>
>>           -- Markus
>>
>

-- 
Marco Molinaro
INAF - Istituto Nazionale di AstroFisica
Osservatorio Astronomico di Trieste
email marco.molinaro at inaf.it
tel. [+39] 333 33 20 564 [also Telegram]
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