On 04/29/2015 01:47 PM, Andrew Dalke wrote: > Postel's Robustness principle is a mistake. > > See RFC 3117 for elaboration, ... > Or from > http://cacm.acm.org/magazines/2011/8/114933-the-robustness-principle-reconsidered/fulltext > :
There is a difference between ACM members writing network protocols and "domain" people writing junk. XML in this example > Or http://www.tbray.org/ongoing/When/200x/2004/01/11/PostelPilgrim for > an example with XML. is written by a ball street wanker. Much of xml is. Similarly, MOL/SDF is written by chemists. > On the pro-ish side, which > recommends a "patch" to the law, see > http://langsec.org/papers/postel-patch.pdf . I've spent enough time looking for definitive documentation on any number of file formats to know: "domain" people don't do that. With one or two exceptions to reinforce the rule. Again, c.f. to computer scientists: every RFC starts with the definitions of "may", "must", etc. >> - if a record contains forbidden values, stop writing to the file, >> with an error. > > Yes, I agree with this. What constitutes "forbidden"? Simply put, the ones that lexer will match as "not values". > If there is an error, does the writer generate a partial record, My interpretation of "conservative" is wipe out the file then crash and burn. With a useful error message. > For what it's worth, those values are acceptable. The following is legal, > according to the specification: ... If you define your lexical tokens properly, no problem. The problem is when lexer can't decide what's what. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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