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From Stefano Mazzocchi <stef...@apache.org>
Subject Re: Heads Up: Cocoon and Web Services
Date Wed, 13 Feb 2002 21:57:59 GMT
Sam Ruby wrote:

> This question is essentially equivalent to asking "given a schema for an
> input and a pipeline, can we predict the schema of the output?".

No, currently there is no algorithmical way to perform this in Cocoon.

Can it be created?

Yes, but:

1) we need a "real" namespace-driven and inheritance-extenible
validation language (I'd use RelagNG if you asked me, but it could still
not be enough for this)

2) we need a way to associate a namespace to its schemas (yes, not even
the W3C has understood that schemas should be associated to namespaces,
not documents, and the overall opacity of XMLSchema reflects this
evidently).

3) we need to augment the sitemap component interfaces semantic to
indicate the schema of their output.

NOTE: in any case, this algorithm *must* work like a view and probably
be as expensive as generating the result, so it must be a runtime
request (it cannot be heuristically assumed).

For example,  the XSLTTransformer has no notion of what comes out of it
because it depends on the input *and* on the stylesheet.

One thing to think about: do the Axis people deal with the concept of
pipeline aggregation?

-- 
Stefano Mazzocchi      One must still have chaos in oneself to be
                          able to give birth to a dancing star.
<stefano@apache.org>                             Friedrich Nietzsche
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