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From "James Strachan" <james.strac...@gmail.com>
Subject Re: Topics and subtopics - Newbie
Date Tue, 16 Jan 2007 09:19:24 GMT
On 1/15/07, MqUser <pmres@sonic.net> wrote:
>
>
>
> But I thought that the publish subscribe system was to enable one to
> subscribe to what they wanted and not other messages, thus necessitating
> querrying.

Yes it does. With messaging systems, you don't 'query' you 'subscribe'
to what you want.

> And SQL 98?

SQL is used for the selectors (filters) used on subscriptions. So you
never 'query' a message bus, you subscribe to a stream of messages
which can be filtered using selectors.

-- 

James
-------
http://radio.weblogs.com/0112098/

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