VOEvent References

[Roy Williams]

Mike
I should probably not talk any more about <Reference>, since my work 
does not use it. Instead, there is another way to indicate URL links in 
a VOEvent, specifically as a Param, for example:

<Param name="Light curve chart" ucd="meta.code.url"
 
value="http://nesssi.cacr.caltech.edu/catalina/20110314/1103141070764142069p.html">
     <Description>Light curve for the alert</Description>
</Param>

The point here is that the author and subscriber can understand the 
meaning from the *stream* metadata, figure out response, well in advance 
of the arrival of the first event. Then *every* event of the stream will 
have this same semantics.

Whereas the Reference name and type is unconstrained and not seen until 
the event arrives. I have no idea how to make code that can respond 
effectively to an arbitrary <Reference>.
Roy