- From: Gabe Beged-Dov <begeddov@jfinity.com>
- Date: Thu, 06 Jan 2000 07:45:56 -0800
- To: "Ralph R. Swick" <swick@w3.org>
- CC: www-rdf-interest@w3.org, "Henry S. Thompson" <ht@cogsci.ed.ac.uk>, xml-schema-comments <www-xml-schema-comments@w3c.org>
"Ralph R. Swick" wrote: > This is standard O-O stuff. Part of your complaint has to do > with naming; in RDF all names have global scope. But as Jonas > Liljegren properly reminds us in > http://lists.w3.org/Archives/Public/www-rdf-interest/2000Jan/0014 > the true name of an RDF property is a full URI. Just as in > any O-O system -- it seems to permit you to reuse names across > classes but the fully qualified name is actually constructed > using additonal information such as the class hierarchy. > While most O-O systems have a syntactic convience that allows, > e.g., "this->" to be omitted, the fully qualified name for a > class method or variable is always unambiguously defined. > Such naming conveniences have a lot to do with the syntax in > which expressions are written. XML does not (yet) have the > sorts of name constructors that O-O systems have. XML > Namespaces are the closest thing provided by XML -- and the > RDF XML encoding uses them heavily. Putting the class > qualification into the namespace URI is a simple transformation > and precisely matches the usage in traditional O-O systems. My primary approach to mapping OO stuff to XML is to use a namespace for each class and place the properties/variables/accessors in the same namespace. As you say later in your message, the power of RDF is that it allows both the definition and the use of these "accessors" to be made at a separate location from the definition/use of the class. You then use the namespace to create the binding between the class and the accessors rather than lexical containment. XML Schemas focuses on lexical containment for the definition/use of classes and their accessors. I was assuming that locally scoped types would have the same namespace as their class but a recent exchange on the xml-schema-comments list [1] indicates that this isn't the case. The reference implementations of SOAP from developmentor [2] place thier accessors in the default (null?) namespace which is where I first noticed this "feature". Henry mentioned that there were compelling arguments both for and against binding accessors to the parent element namespace. I'm wondering if there should be an RDF perspective on this issue? Cordially from Corvallis, Gabe Beged-Dov [1] http://lists.w3.org/Archives/Public/www-xml-schema-comments/2000JanMar/0010.html [2] http://www.develop.com/soap -- --------------------------- http://www.jfinity.com/gabe
Received on Thursday, 6 January 2000 11:00:30 UTC