An STC "when" and "where" example

[Rob Seaman]

Alasdair Allan writes:

> I think we need something much simpler, at least to start with, it's 
> possible that in time, we may need to add complications into the 
> specification. But to start with at least I think we have to, must, 
> keep the VOEvent spec as lightweight as possible.

Perhaps the implementations can start simple, but the specification 
should be as complete as possible from the start.  I don't think this 
is impossible or even difficult.  Make the inclusion of one or more STC 
objects an optional feature.

> Eh? Unless we're trying to design something very different than I 
> think we're trying to design, I really don't see spectral 
> characterisation as being central to a VOEvent specification.

Obviously a VOEvent must include some statement of what the event 
actually was.  If the event represents a detection, one could use STC 
to characterize its spectral signature.  This could perhaps simplify 
the remainder of the VOEvent specification.

Rob Seaman
NOAO