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Subject: Re: DOCBOOK-APPS: XInclude doesn't validate with xmllint
On Thu, Oct 03, 2002 at 10:27:23AM -0700, Bob Stayton wrote: > One little item... > I've noticed in your example and the XInclude Candidate > Recommendation that the content model for xi:include is: > > <!ELEMENT xi:include (xi:fallback) > > > Shouldn't there be a question mark to make xi:fallback optional? > > <!ELEMENT xi:include (xi:fallback?) > > > The spec [1] seems to permit this. Here is the relevant part: > > 4.4 Fallback Behavior > XInclude processors must perform fallback behavior in the > event of a resource error, as follows: > > If the [children] of the xi:include element information item > in the source infoset contain exactly one xi:fallback > element, the top-level included items consists of the > information items corresponding to the result of performing > XInclude processing on the [children] of the xi:fallback > element. It is a fatal error if there is zero or more than > one xi:fallback element. > > When I first read this, the final sentence suggested that > xi:fallback is required. But that sentence is qualified > by the first paragraph, which says fallback is invoked > only when a resource error occurs (when the xinclude URI can't be > resolved). [...] > [1] XML Inclusions (XInclude) Version 1.0 > W3C Candidate Recommendation 17 September 2002 > http://www.w3.org/TR/xinclude/#fallback Dohh, okay that's a bug in the XInclude spec IMHO The (non-normative) DTD example in 3.1 should really read <!ELEMENT xi:include (xi:fallback*)> to match the prose and the <xs:choice minOccurs="0" maxOccurs="unbounded"> present in the Schemas on top of section 3. Daniel -- Daniel Veillard | Red Hat Network https://rhn.redhat.com/ veillard@redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/ http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
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