From owner-shlaer-mellor-users@phoenix.projtech.com Thu Sep 6 12:26:22 2001 Received: from phoenix.projtech.com (209-234-139-66.twtelecom.net [209.234.139.66] (may be forged)) by saturn.cs.uml.edu (8.11.6/8.11.6) with ESMTP id f86GQLs309638 for ; Thu, 6 Sep 2001 12:26:22 -0400 (EDT) Received: (from majordom@localhost) by phoenix.projtech.com (8.9.3+Sun/8.9.1) id JAA26639 for s-m-users-outgoing; Thu, 6 Sep 2001 09:01:39 -0700 (MST) X-Authentication-Warning: ns.projtech.com: smap set sender to using -f Message-ID: <3B979C64.E5C464A6@worldnet.att.net> Date: Thu, 06 Sep 2001 11:55:16 -0400 From: "H. S. Lahman" X-Mailer: Mozilla 4.75 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: shlaer-mellor-users@projtech.com Subject: Re: (SMU) Question about Bridges References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-shlaer-mellor-users@projtech.com Precedence: bulk Reply-To: shlaer-mellor-users@projtech.com Errors-To: owner-shlaer-mellor-users@projtech.com Status: RO "H. S. Lahman" writes to shlaer-mellor-users: -------------------------------------------------------------------- Responding to Hogan... > When talking about a bridge in general, one may be referring to the > client/server relationship that exists in which a client domain levies > requirements on a service domain. Or alternatively, one may be > referring to a specific bridge interface (or bridge mapping) in which > something in one domain is mapped to something else in the other > domain. > > The first type of bridge is represented on the domain chart as an arrow > from the client domain to the service domain, and a description is > usually written to document the assumptions made. The second type can > be represented in different ways... possibly a mapping table or in an > action language. > > Is it always necessary for the first type of bridge to exist between > two domains for the second type of bridge to exist between the same two > domains? In other words, is it required to have a client/server > relationship in order to have specific bridge mappings between two > domains? > > For example, domain A levies requirements on domain B who in turn > levies requirements on domain C. Can specific bridge mappings exist > between domain A and domain C without a client/server bridge shown on > the domain chart? I believe that the bridges should correlate with the client/service relationships (i.e., methodologically one should not be able to connect a bridge between domains w/o a client/service dependency). How can A communicate with C without C providing a service of some sort? If C is providing a direct service to A that is quite different than providing a direct service to B because A is defining the service rather than B. Therefore there must be a direct client/service relationship between A and C. (Otherwise B might not actually choose to delegate that responsibility.) ************* There is nothing wrong with me that could not be cured by a capful of Drano. H. S. Lahman hsl@pathfindersol.com Pathfinder Solutions -- We Make UML Work http://www.pathfindersol.com (888)-OOA-PATH