On 6 Nov 2015 11:33 p.m., "Ted Zlatanov" <tzz@lifelogs.com> wrote:

> I'm not sure how to provide the metadata, and it should be ignored by
> the default (current) message handler.  Maybe it could be string
> properties applied to the first parameter?  I *need* to know this before
> writing code.

How about using CL-style keyword parameters?

Like: (message "hello" :source x :priority y)