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   RE: [xml-dev] Postel's Law Has No Exceptions

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Julian Reschke <julian.reschke@gmx.de> proposes:

> The issue is different. If server A (sold by a big company and widely
> deployed) accepts broken requests, clients may start relying 
> on that behaviour. Other, smaller vendors thereby have the 
> choice of either implementing to the spec (rejecting the 
> broken requests) or emulating the broken server behaviour.
> My point being, unless *everybody* is accepting the same kind 
> of broken requests, interoperability will actually be 
> *worse*. But if indeed everybody
> *is* accepting the same requests, it would have made more 
> sense to actually define this as *correct* behaviour and have 
> draconian error checking.

I don't think the situation works out that bad in reality: years ago I
worked with a company that developed software for the exchange of X.12
health care data and Blue Cross/Blue Shield ("standard") health care
data.  Very regularly we would run into data produced by other vendors
that did not conform to one standard or another.  I don't think we ever
encountered a case where the vendor emitting the offending data was not
willing to fix their software to emit conformant data...


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