On Monday, September 19, 2005, 11:38:44 PM, Jonathan wrote: JW> So it seems to me that in trying to use DTDs to require namespace JW> declarations *and* validate that those declaration's contain the correct JW> values (something DTDs appear incapable of doing), the SVG WG has JW> actually made it unnecessary to declare the SVG and XLink namespaces JW> when a doctype declaration is present. Would this be an unfair or JW> inaccurate assessment of the situation?
Its inaccurate. If SVG content that has a 1.0/1.1 DOCTYPE happens to be processed by a DTD validating parser then those declarations in the DTD will be reported, yes. Since content cannot tell whether it will meet a validating parser and since there is no way in the content to request validation, the SVG spec requires that the instance also contain the namespace declarations. Content that has the DOCTYPE and does not have namespace declarations in the instance is conformant to the XML 1.0 spec. http://www.w3.org/TR/REC-xml/#dt-default It is not conformant to the SVG 1.0 or 1.1 specs; for interoperability, we impose an additional constraint. And as "Namespaces in XML" notes "Thus, unless the use of a validating processor has been specified, there can be no assurance that the contents of attribute values have been checked for conformance to this specification." If we are talking about a programming API where a validating processor can be and has been specified, then the assurance is there. If we are talking about documents loaded off the Web or from local disk, there is no way to specify that a validating parser must be used. Note in addition that applying a DTD which has notbeen specified in a DOCTYPE and using a validating DTD parser will report false negatives (invalid documents which are in fact conformant to Namespaces in XML) for example <abc:svg xmlns:abc="http://www.w3.org/2000/svg"; viewBox="0 0 15 6"> <xyz:text xmlns:xyz="http://www.w3.org/2000/svg"; x="1" y="5" font-size="2.2"> I'm a conformant document! </xyz:text> </abc:svg> -- Chris Lilley mailto:[EMAIL PROTECTED] Chair, W3C SVG Working Group W3C Graphics Activity Lead Co-Chair, W3C Hypertext CG --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
