Not the iceberg per se. It is the lack of a system to change course fast enough once observed. Momentum and a slow uptake are not a survivable context. Internet Time is only a reason to change authorities if the authority has a low latency to response. The authority may have that characteristic in the beginning, but as missions are added and the scope of control expands, the characteristic is lost. I guess that is why layering is such a black art. len -----Original Message----- From: Uche Ogbuji [mailto:uche.ogbuji@f...] Absolutely! But don't think ranting will do the trick. James Clark outlined the problems with blessed types in his XML 2001 keynote. I've railed against them and wished for more generic facilities for constraint expression rather than a monolithic type-library-by-committee. I used irrational numbers as my example, picking a purposefully tricky case. Simon has brought up the more practical geospatial example. But the folks who could clean up this mess mostly just take in all the warnings and blithely respond "sorry we had to satisfy OO and relational data type needs from our chartered requirements". And so the Titanic lumbers on. Nought but the iceberg itself will alter its course.
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