[TAP] sync vs async

[Roy Williams]

>  is that it's hard to make a synchronous query-service that works 
> reliably. 
>
> My own opinion is that I don't want to see the VO loaded with services 
> that fail at random because the protocols and implementations are naive.

Thank you for bringing out this contrast, Guy. Either we have services 
that are simpler to bring to market, but inherently less 
robust/scalable, or we have complex protocols and hope they can 
eventually be implemented in a robust way.

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