On the "when" and "where"

[Roy Williams]

> Do you really mean to report an event that happened, nobody knows
> when, somewhere within a circle with (radius? diameter?) of one
> degree?

There are many astrophysical events that have poor spatial location. The specificity 
comes in another dimension, perhaps time, perhaps wavelength. GRB, LIGO, cosmic ray 
showers come to mind.

These communities may already have schema for describing their particular events, and 
I hope to include their semantics in the VOEvent discussion.

Roy