[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: SOX: element<->class mapping
Peter Murray-Rust wrote: > > ... > > Some people have suggested mappings are very difficult. I'm more optimistic! > > > >In a CLOS environment, this depends only on a mechanism which identifies lisp > >packages with xml namespaces. For java, by analogy, a mechanism which > >identified java packages with xml namespaces would suffice. The point is, that the mapping between serial encoding and application data is best separated into two stages: encoding and application modeling. The first is very simple. A minimum of element method specialization is necessary in order to encode / decode application data and type specialization is useful as for method dispatching in the second phase. For this purpose it suffices to declare a relation between java packages and xml namespaces and to use introspection to map from element name to class. One would have standard java packages appropriate for and associated with standard elements. The second (items 3 - 5 in the original note) is more complex. It is also, in my experience, not to be managed by simply identifying the correct class to use to decode the stream. The storage issue (5 and your response) is one example. Another is the issue of (re)integrating xml-encoded data into a data store. Decoding the data is just the first step. The decoded instance is then subject to more complex processing - to check its consistency (validation does not suffice), to translate it into internal form, to bind nominal links to instance data, etc. The first stage should not be burdened with the more complex mechanisms which this second stage requires. It should be kept as simple (and standardizable as possible). If that is accomplished, then the interface between the application and the parser can be set between the two phases. 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/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe 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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