[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Announce: XML Schema, The W3C's Object-Oriented Descriptio
Bullard, Claude L (Len) wrote: > > Hoping sincerely that your book is one that enables right choice > based on well-understood requirements. Best of luck. > Some of my requirements for a schema language: 1) No surprises. I want to be able to express the constraints for a desired collection of documents in a straightforward fashion. I don't want the schema language to GPF for unexpected reasons. 2) Good power/complexity ratio. I will accept complexity only if it is accompanied by sufficient power. If I am going to slug through learning a new language, I expect to be rewarded for doing so. 3) Easy for easy tasks. I don't want to make everything complicated. See above. Off the top of my head that's a few. For example, we've long been told that XML DTDs dropped the "&" construct because of the cost/benefit ratio -- cost for the implementation that is, because this construct is rather intuitive for people designing document formats (translation: it makes expressing certain document constraints _easy_). Now it seems that RELAXNG has brought back the "&" at least in the form of "interleave" yet without any great increase in complexity indeed the language is simpler than XML Schema. So that is a _good thing_ right? Jonathan
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