Re: XPath/XSLT 2.0 concerns (off topic)
> Jeni said: > > >Actually I think we can break this pattern down into two classes: > > > > 1. grouping elements based on their *content* -- in other words, the > > *type* hierarchy > > > > 2. grouping elements based on their *context* -- in other words, the > *substitution group* hierarchy > > > The current focus in XPath/XQuery is very much on 1 rather than 2. > > Yes, but that has been one of my major objections to W3C XML Schema > all along. W3C only gave us #1 really and some very crude mechanisms > for #2. The XPath/XQuery folk are heading in the same direction. > > I've tried to talk to some of the schema folks about the real need for > "typing" of the second sort and been told (rather snootily) that those > are "mere usage classes" not proper CS "types". Whoever told you that did not deserve to pass CS. I do agree that one of the most damaging problems with WXS types and the work that has cascaded from them is the terribly narrow perception of what a type is. I've argues that here before. > But I am an applications > not a systems person, and in my world, usage grouping, whatever we call it > is probably the most useful kind of grouping. I truly do not care that > these "components" all have the same name, or the same model, I care how > (and where, structurally or semantically) they can be used. Agreed. Types are most generally a construct of usage patterns, not fiat. Programmers who are so used to having to write int foo; Seem to forget that very quickly. -- Uche Ogbuji Fourthought, Inc. http://uche.ogbuji.net http://4Suite.org http://fourthought.com Apache 2.0 API - http://www-106.ibm.com/developerworks/linux/library/l-apache/ Python&XML column: Tour of Python/XML - http://www.xml.com/pub/a/2002/09/18/py. html Python/Web Services column: xmlrpclib - http://www-106.ibm.com/developerworks/w ebservices/library/ws-pyth10.html
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