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   RE: [xml-dev] Categories of Web Service messages: data-oriented vs actio

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> From: Alaric Snell [mailto:alaric@alaric-snell.com] 
> > Then one day you wake up to find you have 
> > _lots_ of pairs making RPC calls and trying to reorder of repurpose 
> > some of them (or heaven forbid, their databases) without breaking 
> > something else somewhere else is extremely difficult; 
> there's too many 
> > permutations and the network is suddenly not the sum of its parts 
> > anymore. You're out of control of the code.
> But why is this any different to when local procedure calls 
> between software 
> modules are complicatedly inter-related?

Hi Al,

It's not different (but Sean's already said that). There are a couple of
things (at least) that make it more of a pain though, 1) you mightn't
own all the processes involved (a bit like not having source code in a
local app maybe) 2) the scale of a distributed system makes refactoring
your way out of trouble tough compared to a local app (locally, you can
often see what broke in front of your eyes).

Bill de hÓra


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