[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XCatalog proposal draft 0.1
Paul Grosso scripsit: > System ids have been pretty obvious in most cases for decades. > While it is true that 8879 allows system ids to be almost anything, > all the SGML systems I've seen figure a regular looking system id > is a file name, and that works fine. In fact, it wasn't until > the third version of the SGML Open Catalog TR9401 that we added > mapping of system ids. But in XML *that doesn't work*, at least not in all cases. Systemids are URIs, and a systemid that looks like "foo.bar" is a relative URI, not necessarily a local file name. If you are processing a local file, it probably will be a local file name, but if you are processing a document fetched by HTTP, then it will be another document fetched from the same directory of the same server. This is why I believe systemid mapping is inappropriate for XML. When a document author provides a URI, he or she has a right to assume that the document processor will take that URI at face value. > The real reason for the SGML Open Catalog was because 8879 did not > define a way to map public ids into much of anything. And neither > does XML. Yes, and that's the property I want to keep. The four entry types Map (PUBLIC in Socat syntax), Catalog, Delegate, and Base provide what's needed for an infrastructure, analogous to DNS, to make public IDs truly *public*. -- John Cowan http://www.ccil.org/~cowan cowan@c... You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5) 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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