Cart
[Home] [By Thread] [By Date] [Recent Entries]
--On 09 June 2002 17:08 +0700 James Clark <jjc@j...> wrote: > Certainly there is a need to be able to associate a schema with a > document. We discussed this during the development of RELAX NG, but we > reached the conclusion that it was better not to include this > functionality as part of the schema language. Another reason I forgot to mention is that I think the relationship between instances and schemas is many-to-many. In particular, an instance can be simultaneously valid against multiple schemas. Here I don't just mean there may be a separate schema for each namespace: the elements in a single namespace in a single document may be valid against multiple schemas. One common example is that you have a both a public schema which is relatively loose and a private schema which is much tighter. In fact, you have can have a whole hierarchy of organizational levels (e.g. industry, company, project), with the schema becoming less general and more specialized as you move down the organizational tree. An approach where you specify a single schema in the instance doesn't seem to me to deal with this scenario very well. James
|
