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Data Access Layers are about "abstracting away from the presentation as much as one can". XML isn't. XML doesn't care. It's just good practice from a particular point of view that is shared by a lot of people. But it is a myth that XML is 'about' anything except a common syntax. Wishing it were otherwise won't make it so. I agree about URI theology, but it is also basic to web architecture. It is a neat solution until someone asks us to define 'resource' and we discover there is no 'there' there. len From: Michael Kay [mailto:michael.h.kay@n...] But XML is about abstracting away from the presentation as much as one possibly can, and to my mind XLink doesn't do that. Part of the problem, I think, is the focus on URIs as identifiers (and links). I've heard a number of talks recently advocating that we should use URIs whenever we want to identify anything, and I simply don't think that's the right direction. To my mind <postcode>RG4 7BS</postcode> is a perfectly good identifier (for a small piece of geography in which my house is found), and any technology that requires me to write it differently if I'm going to use it for linking purposes is too constraining. Even in the document world, authors should be encouraged to write <postcode>RG4 7BS</postcode> without too much thought about the fact that in one particular application, hovering the mouse over it might show you a map.
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