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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] How could RDDL be distributed ?
 Hi, <disclaimer> My jumping that late in the wagon shouldn't be seen as a lack of interest and RDDL is one of the 2 coolest ideas I have heard for months (the other one being TREX)... </disclaimer> I wonder though if RDDL is addressing all the issues we had with DTDs and DOCTYPE. Going back to our roots, SGML and XML have felt the need to separate the formal identifier of the document type from the location of the DTD and I think there is still this need with namespaces and that one should be able to separate the location of the RDDL document from the namespace that is the "name" of a vocabulary. We can probably learn from recent experiences to give a hint on how this could be achieved and I'd suggest that we give the possibility to define alternative locations at the 3 places where it seems possible to do so (by order of precedence): 1) Like it's specified by W3C XML Schema, and like it's the case with XSLT, the APIs should allow to define alternative locations for the RDDL documents. This functionality is lacking in XML 1.0 and the workarounds (hacking an entity resolver or defining bunch of symbolic links) aren't really satisfactory. 2) Still like it's the case for W3C XML Schema or XSLT, it should be possible to define alternative locations in the instance documents. This would probably lead to defining a namespace for RDDL in instance documents. 3) It should be possible to define alternate locations in the RDDL documents themselves. These mirrors locations and the hints to let applications know how/when they should use the mirrors might be defined as RDDL resources... The next thing if we'd want to go in this direction would probably be to facilitate the management of the replication of RDDL documents. Things such as a version id and a time to live borrowed from DNS systems could be of use. Another alternative would be to rely exclusively on the protocol caching facilities, but I think that they are currently used in a too randomly fashion to be considered as reliable. These are just first thoughts about this issue that --unless I have missed some exchanges-- doesn't seem to have surfaced yet. Hope this helps Eric -- ------------------------------------------------------------------------ Eric van der Vlist Dyomedea http://dyomedea.com http://xmlfr.org http://4xt.org http://ducotede.com ------------------------------------------------------------------------ 
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