[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] FPIs as locators in XML-links ?
I may miss something (and in that case thanks for the help!) , but I feel that the current specification of locator in XML-LINK don't open an easy way to avoid including URLs in XML documents. It is true that a URL can be considered as a unique id of one physical copy of a resource, but this id is transient : machines may be changed, and "publishers" (any entity putting content on the Web) may decide to migrate a document repository from one place to another. If locators in XML-LINKS are URLs, this implies that in case of change of URL, many authors -a- should ideally be notified in some way of the change if it is relevant for them (ie: if they have in their own documents links pointing to resources which have changed of URL) -b- have to retrieve all the document they have published which contain a link to the modified URL; -c- have to edit all these documents. That's in fact exactly the situation with the HTML-based Web. I feel that the SGML practice to use Public Identifiers and to store mappings of PUBLIC identifiers to SYSTEM identifiers in a Catalogue file facilitates greatly the management of large collection of documents: - a "publisher" may distribute updates of his public catalogue to the community with which he shares a number of resources; - the catalogue is the only file you need to edit when any Public ID gets associated to a new physical resource; - in case of mirror copies of Web sites, the catalogue may be an easy mean to impose to your browser to look for a given document at a given site, without having to specify it at each traversal of a link; Moreover, including URLs in XML documents appears contradictory to the general phylosophy of SGML, which I guess could be resumed as "Ensure long-term life of documents". I would be very interested to read some comments from SGML experts on the list, to help me understand the reasons why the XML draft specs exclude -so far- using Public IDs in links. Best Regards Alain Michard Mediaculture - Direction du Développement INRIA - Domaine de Voluceau BP 105 F-78153 Le Chesnay Cedex - France Tel: +33 1 3963 5472 Fax: +33 1 3963 5114 xml-dev: A list for W3C XML Developers Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To unsubscribe, send to majordomo@i... the following message; unsubscribe xml-dev List coordinator, Henry Rzepa (rzepa@i...)
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