Path: dp-news.maxwell.syr.edu!spool.maxwell.syr.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!xs4all!news2.euro.net!sn-ams-06!sn-xt-ams-04!sn-ams!sn-feed-ams-02!sn-post-ams-02!sn-post-sjc-01!supernews.com!news.supernews.com!not-for-mail From: Robert Martin Newsgroups: comp.object,comp.databases.theory Subject: Re: Canonical DB Date: Thu, 22 Jun 2006 22:48:26 -0500 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <2006062222482677923-unclebob@objectmentorcom> References: <1148940908.338233.159400@j73g2000cwa.googlegroups.com> <4yKeg.14747$A26.346889@ursa-nb00s0.nbnet.nb.ca> <1148985135.317238.16950@38g2000cwa.googlegroups.com> <2006053107402343658-unclebob@objectmentorcom> <1149242615.012883.113990@f6g2000cwb.googlegroups.com> <2006060908582877923-unclebob@objectmentorcom> <44892ca7$0$31642$e4fe514c@news.xs4all.nl> <2006062012185117709-unclebob@objectmentorcom> <44983839$0$31637$e4fe514c@news.xs4all.nl> <2006062116530443658-unclebob@objectmentorcom> <4499d9ed$0$31646$e4fe514c@news.xs4all.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit User-Agent: Unison/1.7.5 X-Complaints-To: abuse@supernews.com Lines: 31 Xref: dp-news.maxwell.syr.edu comp.object:140757 comp.databases.theory:42099 On 2006-06-21 18:47:03 -0500, mAsterdam said: > Robert Martin wrote: >> mAsterdam said: >>> >>> And I asked "Which (or which types of) >>> computations are easier [with a >>> navigational structure]?" >> >> Things like tree searches, graph walks, etc. > > No, tree searches and graph walks are things > you *need* to do (and specify) when all you have > is navigational structures. They are part of their cost. Uh... So in RM there just *aren't* graphs or trees? > > Now where is the benefit - what are you computing: > Which (or which types of) computations are easier > with a navigational structure? The cheapest path between two nodes through a network graph? -- Robert C. Martin (Uncle Bob)  | email: unclebob@objectmentor.com Object Mentor Inc.            | blog:  www.butunclebob.com The Agile Transition Experts  | web:   www.objectmentor.com 800-338-6716                  |