Michael Smith wrote:
Then it seems to me that the community of people using a class of document types that have several profiles in the same namespace should try to come up with a way to make instances of the different profiles truly self-descriptive so that people and machines have some way of distinguishing them one another. A way more robust than this proposed PI.
This is not possible in the real world. In one project for my customer I use very restricted subset of XHTML and I need to distinguish it from full XHTML. Do you think that this small project is reason for W3C to release new version of XHTML that will add version/profile attribute? I think now. It will take years before some best practise about versioning and schema extensibility emerge and will be consistently used by schema designers.
We can hold long discussion about limitations of XHTML design, but this will not solve problem.
I guess I am still not convinced that it's impossible to create a locating-rule system that can solve the problems you have described. It may not solve the problem as easily as the PI would, but it would solve it better.
How would you solve case when the schame associations is based on the filename (because there is no better way for some particular case) and the file is renamed/moved?
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