The U/S/C triad is mandatory whenever the optional <info> block is
present. In most cases you're right, a Cancel won't have an <info>
block at all. However, some senders have expressed a desire to be
able to annotate their Cancel messages with new <headline>,
<description> etc. elements... e.g., in the case of an all-clear from
a hazmat incident. In that case, the U/S/C values should reflect the
new, post-crisis situation. (I've never been entirely satisfied with
that arrangement myself, but nobody's come up with a simpler one.)
- Art
At 11:57 AM -0500 1/31/05, Bob Wyman wrote:
>In CAP V1.0 and draft V1.1, it appears that <urgency/>, <severity/>,
>and <certainty/> are always required fields. However, it doesn't
>seem to make sense that these fields would be required when the
>msgType is "Cancel." Why is it useful to require that these fields
>be present when a message is being cancelled? If they are present,
>what should the value of these fields be when the msgType is
>"Cancel"?
>Typically, when one is canceling a message, one wants to say as
>little as possible about the original - you just want it to go away.
>
> bob wyman
>
