- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 27 Sep 2001 20:12:13 +0100
- To: "Aung Aung" <aaung@microsoft.com>
- Cc: <xmlschema-dev@w3.org>
"Aung Aung" <aaung@microsoft.com> writes: > >So since valid includes must be from a schema doc't to a schema doc't > >which _share_ a targetNamespace value, references in the includer to > >components defined in the includee look just like references in the > >includer to itself. No transfer of namespace bindings, which are > >purely a matter for the XML Namespaces REC, is implied or required. > > Henry, Your answer does not quite answer the question Mike is asking. > How about references in the includee to > components defined a different includee?? > > The example of the issue is below. > Questions: > 1. should the "a.xsd" be valid XSD? please note that type="foo" in > b.xsd is not qualified (there is no namespace declared for it). > > > a.xsd~~~~~~~~~~ > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" > targetNamespace="foo" xmlns="foo"> > <xsd:include schemaLocation="b.xsd" /> > <xsd:include schemaLocation="c.xsd" /> > </xsd:schema> > > b.xsd~~~~~~~~~~~ > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> > <xsd:element name="foo" type="foo"/> > </xsd:schema> > <!-- > Q?: Does "b.xsd" requires namespace declaration > xmlns="foo" > --> This _is_ answered in my reply. type='foo' is interpreted in the context of b.xsd as an XML document, in which there is no default NS declaration, so this is a reference to {None}foo _as it stands_. > c.xsd~~~~~~~~~~~ > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> > <xsd:simpleType name="foo"> > <xsd:restriction base="xsd:string"> > <xsd:enumeration value="test"/> > </xsd:restriction> > </xsd:simpleType> > </xsd:schema> And this defines {None}foo, since there is no target namespace. So despite the fact that this _is_ an example of chameleon include, which was explicitly not addressed by my reply, including both these files will always work: a) They are included into a schema which itself has no target namespace, in which case they are unchanged and {None}foo will match {None}foo b) They are chameleon included into a schema which does have a target namespace, in which case both the ref and the def will be converted to {[tns]}foo. ht -- Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh W3C Fellow 1999--2001, part-time member of W3C Team 2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/
Received on Thursday, 27 September 2001 15:11:34 UTC