[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Object-oriented serialization (Was Re: Some questions)
Ah, but the nuts and bolts of specific *behaviour* over links will have to be defined, ultimately as procedural code of some sort, in some generally invocable form. The logic (case, sequential, conditional) leading to the code which implements that behaviour might well--and probably ought to be--expressed as XML text, but at some point, from a leaf node of an XML document expressing a decision tree, it will be necessary to invoke procedural code to implement a defined behaviour. That procedural code might--and probably ought to be--parameterized by XML and designed to return XML, but of itself, as procedural code, it is opaque to the XML which invokes it. That procedural code, implementing a specific behaviour, is the 'class of resource' which you are looking for (as its opacity to the instance demonstrates). The behaviour expressed in that procedural code is invoked via a particular URI, but a unique process is instantiated only in the scope and context of the current document, and presumably only through parameterization specific to the instance, passed to generally available code. In fact, anything which might reasonably be described as behaviour is generally available to XML processing only as a 'class of resource': that generally available class must not be confused with its particular instantiation, for an instance invocation of that behaviour via a particular URI does not impair the availability of that URI--and of the behaviour it addresses--to other invocations from different contexts. Rick Jelliffe wrote: > Yes, except XLinks are specified in instances, not as a schema per se. > I hope the XML Schema will have some extension mechanism to > allow these kinds of thing, but who knows. > > It is true that sequence and containment relations between elements > in a content model could be treated of as some kind of extended link. [snip] > And we cannot use hrefs to the instances because we don't know > what the instance document URI is: a URI identifies a particular > resource not a class of resources. XLinks are not designed for > us as schema declarations. > > So I think there needs to be first-class support for this in the > schema language itself: in the case of XML Schemas, probably > the most possible thing would be a role attribute (or some equivalent) > on groups. xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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