Re: [Summary] Characterization of Schematron - Usage and Featu
On 1/24/07, bryan rasmussen <rasmussen.bryan@g...> wrote: <snip/> > The algorithmic check is more along the lines of: > > A textnode has data that can be validated using a well-known algorithm > such as a modulus 10 function. As such it can not be done via > Schematron, however in most actually occuring markup situations we do > not have just a textnode, we have a textnode that has some other > information represented by the markup pertinent to that textnode, such > as this textnode that can be validated via the modulus 10 function is > a social security number, as such the algorithm can be applied because > we know when we have to stop, we do not have to loop until we stop. > > Basically this is something one might like to see in a datatype > defining language, and in fact if I understand my cursory scanning of > the DSDL Datatype Library language the same method could be used to > define datatypes conforming to a particular algorithm (can anyone > correct me if I'm wrong on this?) > > This, as opposed to your example, is actually not something Schematron > is especially good at, it is something of a Stupid Schematron trick > given that writing these by hand is onerous and it is probably best to > either autogenerate the expression or move up a level to do the check. > This is actually why I brought it up because I was pretty sure there > would be very few people that were using Schematron to do stuff like > check that something purporting to be an EAN location number actually > conformed to the algorithm for checking EAN location numbers. > > That said I think that using Schematron for this while not optimal > points to some possible benefits, the fact that it is declarative and > obviously easier for a program to analyse. There is obviously no > halting problem in the schematron assertion I sent before. > Using XSLT 2.0 and xPath 2.0 with Schematron can make this kind of thing more-or-less trivial for a lot of cases... :-) -- Peter Hunsberger
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