[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Designing XML to Support Information Evolution
> hierarchies fail, and this is my struggle with xml at the > moment, when they have to support multiple hierarchies simultaneously. Perhaps it's time to rediscover the network (or Codasyl) data model, which was invented to solve this problem. I have always felt this model is the one that comes closest to a direct representation of the structures that come out of data modelling. In XPath terms, it just means that instead of having one child axis and one parent axis, an element can have any number of different, named, child and parent axes. It's easy enough to represent in XML, you just use ID and IDREFS attributes for the "non-primary" hierarchies. The problem in this area is that XML has too many different ways to represent relationships, and none of them is especially well supported by declarative mechanisms in the schema or query languages. Michael Kay
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