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all, this is a useful debate and part of our learning curve! what worried me were the 'surprises' in what happens in some circumstances - and it is similar surprises that are a problem with express, e.g. use/reference differences (group/complex type...). i tend to agree with ed when he says: > - the whole complex type feature is extremely complex and difficult >to comprehend, and has all kinds of complex interactions >among declarations. and >i do not see a value in trying to guess which 30% of xml schema >will have the most support; what we should be using is the 30% that >most simply and clearly expresses our models and meets our >needs, hoping that we are not alone. but we must also try not to be too clever with this (and this is addressed to myself as much as anyone!), or use the facilities inappropriately. quite a bit of learning to do! robin [i have not had a look at relax ng as yet but i did like the feel of trex which is a part of it.] at 12:18 pm -0400 28/6/01, ed barkmeyer wrote: >all, > >to make it clear that nist does not have a considered opinion on this point: > >i agree with henry that named complex types have value in that they >add expressive capability to an xml schema that groups do >not. this value is particularly useful in mapping from express, >because many defined data types are named aggregate types or >select types, which are best rendered into complex types in xml >schema. yes, they can be rendered into groups instead, but then ...cut -- ----------------------------------------------------------------- robin la fontaine, monsell edm ltd (xml file comparison, engineering data exchange and management using xml) tel: +44 1684 592 144 fax: +44 1684 594 504 email: robin@monsell.co.uk http://www.deltaxml.com