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Subject: Re: Issue: processing of datatypeLibrary and ns attributes
The problem is that the value of the ns attribute in the schema is compared against the namespace URI part of a name in the instance. Suppose we have a schema with <element name="foo" ns="nice Kanji here"> and in the instance we have <foo xmlns="nice Kanji here"> If the ns attribute in the schema is subject to UTF-8/%xx escaping, but the namespace URI specified with the xmlns declaration isn't, then these won't match. However, the XML Namespaces Rec and XML Infoset do not specify that namespace URIs should be subject this processing. If the RELAX NG processor does additional processing on namespace URIs in the instance, then that causes another problem: we could have two attributes <foo x:bar="" y:bar="" xmlns:x="nice Kanji here" xmlns:y="escaped(nice Kanji here)"/> where escaped(nice Kanji here) means the result of doing UTF-8/%% escaping on "nice Kanji here". These would satisfy the constraints of the Namespaces Recommendation, but as far as the RELAX NG processor was concerned we would have two attributes with the same name! My conclusion is that the RELAX NG processor should not do any transformation on the value of the "ns" attribute before comparing it against namespace URIs: it should be compared against namespace URIs exactly as is. In general, I would agree that users should use absolute URIs, or, more precisely, they should use strings which after UTF-8/%xx escaping of disallowed characters are absolute URIs plus optional fragment identifiers. However, I don't see a lot of value in requiring a RELAX NG processor to do validate this. Thus I would be inclined to say that RELAX NG schemas should use absolute URIs (as defined above), but that RELAX NG processors must accept arbitrary strings. For the datatypeLibrary attribute, we have more of a free hand, but I think it's simplest to treat it the same as the ns attribute. ----- Original Message ----- From: "Murata Makoto" <mura034@attglobal.net> To: <relax-ng@lists.oasis-open.org> Sent: Monday, July 02, 2001 8:33 PM Subject: Re: Issue: processing of datatypeLibrary and ns attributes > James Clark wrote: > > > What processing if any should be done on the datatypeLibrary and ns > > attributes? These are defined as URIs. What parts of normal URI processing > > should be applied to these: > > > > (a) UTF-8/%xx escaping of disallowed characters as specified for the anyURI > > datatype > > Yes. > > > (b) resolution of relative URIs per XML base > > I would like to allow absolute URIs only. > > > (c) parsing against RFC 2396 syntax > > If we validate a RELAX NG grammar against a meta grammar, we have to > do that. But if we merely validate instances against a RELAX NG grammar, > I don't think this parsing is necessary. > > Cheers, > > Makoto > > ------------------------------------------------------------------ > To unsubscribe from this elist send a message with the single word > "unsubscribe" in the body to: relax-ng-request@lists.oasis-open.org > > >
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