ADQL grammar validation

[Patrick Dowler]

+1 on Dave's plan

On 19 April 2017 at 05:42, Dave Morris <dave.morris at metagrid.co.uk> wrote:
> Based on this, I would like to propose the following plan.
>
> 1) We create a new WD of 2.1 with the changes from discussions since the
> last interop.
> 2) We add a note to say the BNF will probably be replaced in the next
> version.
> 3) In May we put the 2.1 draft forward as good enough for PR.
>
> 4) Work on 3.0 starts now.
> 5) We use Grégory's and Walter's work as a basis for a new PEG grammar.
> 6) We work on increasing the coverage of SQL features in the validation
> queries.
> 7) We work on the tools to validate the new grammar against those queries.
> 8) We work on updating the main text to match the new grammar.

> Is moving to PEG a good idea ?

Looks promising.

> Does moving to PEG mean a major version step, 2.x to 3.x ?

I think so, yes.

> Is 2.1 good enough for now ?

I think 2.1 is still worth the (remianing) effort. If that means
fixing/clarifying the document and still having a broken-ish BNF then
at least we can clearly state that.


-- 
Patrick Dowler
Canadian Astronomy Data Centre
Victoria, BC, Canada