Re: DOM AS and RELAX?
Mike Champion scripsit: > Concrete suggestions for how the DOM AS module could be cleaned up to > better support RELAX NG would be much appreciated ... that is a use > case for AS, as far as some are concerned anyway. Here are the points I've identified, which may not be complete. 1) There is no way to represent wildcard elements and attributes. These exist in XSD too, but I don't know the details. There are two types of wildcard names in RNG: "any namespace, any name" and "specified namespace, any name". These could be encoded as "*". 2) In RNG you can have choices between child elements and attributes. For example, you can have a content model allowing a "foo" child or a "foo" attribute, but not both. This could be modeled in AS as a choice between two cases, one with an optional "foo" child and no "foo" attribute, the other with a optional "foo" attribute but no "foo" child. However, if there are several such cases in the content model, it leads to an exponential explosion. If you can have a child "a" xor an attribute "a", *and* a child "b" or an attribute "b", there are now 4 cases. If we extend it to "z" we have 2^26 cases. Very bad. 3) Interleave needs to be added to the list "choice, seq, all". 4) The whole idea of top-level element declarations doesn't make much sense in RNG, since there is no distinction between global and local declarations. It's not clear which declaraitons should be directly accessible from the ASMOdel and which not. It's not clear whether ASModel editing edits the ASModel considered as a concrete model, or whether it edits the underlying schema. If the latter, I don't have a clue how this could be adapted to RNG, as lots and lots of details would be missing. -- John Cowan <jcowan@r...> http://www.reutershealth.com I amar prestar aen, han mathon ne nen, http://www.ccil.org/~cowan han mathon ne chae, a han noston ne 'wilith. --Galadriel, _LOTR:FOTR_
PURCHASE STYLUS STUDIO ONLINE TODAY!
Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!
Download The World's Best XML IDE!
Accelerate XML development with our award-winning XML IDE - Download a free trial today!
Subscribe in XML format