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Liam Quin schrieb am 06.08.2009 um 11:11:09 (-0400): > On Thu, Aug 06, 2009 at 03:16:58PM +0100, Dave Pawson wrote: > > On 08/06/2009 10:21 AM, Michael Kay wrote: > [...] > >> Another way to achieve this goal is to allow the designer of an XML > >> vocabulary (=a set of namespaces) to define > >> > > >(a) a list of predeclared namespace prefixes for that vocabulary > >> (b) a list of local names that are known to be in each of those > >> namespaces "Predeclared" and "known". The parsing context (or whatever you would call that) can be statically established. No prefix scoping to deal with. > >> When invoking an XML parser, the user should be able to reference > >> this "vocabulary definition", > [...] > > >> An "nnML parser" is then an XML parser with built-in knowledge of > >> the nnML vocabulary definition. > > This is very close to the proposal I've made... I might be wrong, but I'm not sure it is. Reasons below. > > So for docbook you'd have an author include all 300+ namespaced > > elements ? > > You only need to list those elements that can occur embedded in > another vocabulary, plus the top-level element. For example, a list > item might not make sense without a containing list. But then again, it might: <xsl:template match="Liste"> <list><xsl:apply-templates select="Artikel"/></list> </xsl:apply-templates> <xsl:template match="Artikel"> <item><xsl:apply-templates/></item> </xsl:apply-templates> This particular example doesn't matter much, but with XSLT used to generate XML, it is questionable to preclude any element from appearing embedded in another vocabulary. > So, a docbook list would automatically introduce the docbook namespace > for all the elements it contained (until you got down to ones that > implied some other namespace, such as "svg" perhaps). Voilà the concept of scope reintroduced, isn't it? It's just that now the current namespace is not signalled by a prefix attached to a declaration, but by the last namespace-scope-setting element. In streaming mode, you wouldn't know what namespace you're in unless you swim back up the river to find a namespace-scope-setting ancestor. -- Michael Ludwig
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