[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: The Airplane Example (was Re: Streaming XML)
That and your not going to die if something goes wrong with each built-in safety-switch in your test code... Its hard for me to think of the implications of failed code compared to implications of a failed flight. Please don't take offense by this as I understand what it is you are suggesting but still have a hard time comparing a computer crash to a plane crash. On Fri, 31 Dec 2004 10:56:29 +0000, Dave Pawson <davep@d...> wrote: > On Thu, 2004-12-30 at 16:33 -0500, David Megginson wrote: > > > > > I find the airplane example interesting, since I just spent the > > morning with my head stuck under an airplane cowling (burned-out > > starter solenoid). Obviously, my Piper is fly-by-loose-cable rather > > than fly-by-wire, but what makes airplane systems safe -- whether > > they're mechanical or electronic -- is not error-free design and > > implementation, but an enormous amount of redundancy. > > > > The trick is to make sure that there are always at least two ways to > > do most things (in a cheap plane like mine; sometimes dozens, in > > commercial airliners) and that they are truly independent of > > each-other. > > I don't think that works on EFA and suchlike, particularly not > in the realms of software. Provability and testing rules the day in > that domain. Reliability increases with parallel hardware systems; > Multiple processors similarly help to check each other, but the actual > routines used rely on different approaches. > > -- > Regards, > > Dave Pawson > XSLT + Docbook FAQ > http://www.dpawson.co.uk > > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php> > > -- :: M. David Peterson :: XML & XML Transformations, C#, .NET, and Functional Languages Specialist
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