Path: newssvr20.news.prodigy.com!newsmst01a.news.prodigy.com!prodigy.com!news.glorb.com!green.octanews.net!news-out.octanews.net!news-out.visi.com!petbe.visi.com!news.octanews.net!upp1.onvoy!msc1.onvoy!onvoy.com!news.netins.net!not-for-mail From: "Dawn M. Wolthuis" Newsgroups: comp.databases.theory Subject: Re: Peter Chen and Charles Bachman Date: Wed, 5 May 2004 13:44:10 -0500 Organization: netINS InterNetNews site Lines: 33 Message-ID: References: NNTP-Posting-Host: 199.120.93.7 X-Trace: news.netins.net 1083782659 10068 199.120.93.7 (5 May 2004 18:44:19 GMT) X-Complaints-To: usenet@netins.net NNTP-Posting-Date: Wed, 5 May 2004 18:44:19 +0000 (UTC) X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Xref: newssvr20.news.prodigy.com comp.databases.theory:26220 "D Guntermann" wrote in message news:Hx95nL.F8J@news.boeing.com... > "Dawn M. Wolthuis" wrote in message > news:c7ando$tol$1@news.netins.net... > > "Leandro Guimarães Faria Corsetti Dutra" wrote > > in message news:pan.2004.05.05.02.38.23.931293@dutra.fastmail.fm... > > > Em Tue, 04 May 2004 17:16:28 -0500, Dawn M. Wolthuis escreveu: > > > > > > >> Diagrams aren't models... > > > > > > > > I'll accept that diagrams, in themselves, are not full mathematical > > > > theories, but models they often are, it seems to me. What is your > > > > definition of "model" (as a noun)? > > > > > > A model must include all aspects of the database, or it will > > > be only a draft. > > Wouldn't a model that includes all aspects of the database be an > implementation? Perhaps the word "all" is a little strong. > > > > > With the number of dialogs we have that include information relevant to > > databases, but "orthogonal" to relational theory, my conclusion is that by > > your definition relational theory is not a model -- is that correct? > > I don't want to put words in his mouth, but I think he is arguing just the > opposite. I omitted the implied wink -- sorry ;-) --dawn