Usecases update

[loumir]

in the use cases appendix I have added parts of the remarks concerning how to deal with data product type vocabularies .
The science cases remain the same , only the strategy to write ADQL query is discussed .
This is an attempt to open the discussion in the DM working group for the next step.

[msdemlei]

Nit-pick: product-type isn't draft any more, and advance-product-type hasn't
made it there.

More importantly, we should say that dataproduct_type should normally be matched with query expansion. Right now, the corresponding UDF isn't standardised, but on DaCHS-es you can already say

select top 30 * from ivoa.obscore
where 1=gavo_vocmatch('product-type', 'spectrally-resolved-dataset', dataproduct_type)

or similar. I'd expect a very similar thing will make it into the UDF cat as ivo_vocmatch.

[loumir]

Nit-pick: product-type isn't draft any more, and advance-product-type hasn't made it there.

More importantly, we should say that dataproduct_type should normally be matched with query expansion. Right now, the corresponding UDF isn't standardised, but on DaCHS-es you can already say

select top 30 * from ivoa.obscore
where 1=gavo_vocmatch('product-type', 'spectrally-resolved-dataset', dataproduct_type)

or similar. I'd expect a very similar thing will make it into the UDF cat as ivo_vocmatch.

The advanced data product vocabulary is a work in progress that should go forward .

These products do not belong necessarily to the main branches of the product-type tree , and are not necessarily sampled on the same axes as spatial, spectral, time , etc .
pdf and draws show a statistical behavior of some variable and are not necessarily based on the axes of an observation.
I think we are not at the stage we can adopt a reasoning within the product-type hierarchy for these products .

[iannevans]

A number of updates tweaking formatting and other trivial changes. Tried to make some of the wording "more formal". I made significant suggestions for the "3 Proposals" in the Introductory text that folds in some of my previous feedback while keeping your discussion.