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RE: how to refer to non-namespaced schemas

From: Schwarzhoff, Kelly <kelly.schwarzhoff@commerceone.com>
Date: Mon, 29 Oct 2001 10:52:24 -0800
Message-ID: <C1E0143CD365A445A4417083BF6F42CC01503632@C1plenaexm07.commerceone.com>
To: "'ht@cogsci.ed.ac.uk'" <ht@cogsci.ed.ac.uk>
Cc: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>
Hi Henry,

Is there anywhere in the spec that explains this fact? The reason I ask is
because I have tested similiar schemas in Xerces, and--even when there is no
default namespace--if there is a reference to a type, and it is unqualified,
Xerces treats it like a reference to a type in the current namespace.

Kelly

-----Original Message-----
From: ht@cogsci.ed.ac.uk [mailto:ht@cogsci.ed.ac.uk]
Sent: Monday, October 29, 2001 9:00 AM
To: Schwarzhoff, Kelly
Cc: 'www-xml-schema-comments@w3.org'
Subject: Re: how to refer to non-namespaced schemas


"Schwarzhoff, Kelly" <kelly.schwarzhoff@commerceone.com> writes:

> If I have a schema--call it schema A--with no namespace, and it is
imported
> by another schema--call it schema B--which does have a namespace (I do
this
> by using schemaLocation attribute, not namespace attribute), then how does
> schema B refer to types in schema A. The reason I ask is because it
appears
> to be impossible, as there is no namespace so one would have to refer to
it
> of a QName where there is no prefix. In these cases though, if no
namespace
> is referenced, then when in schema B non-prefixed type references are
> assumed to refer to types in current schema (B).

It all works just fine, you just have to be careful with your
namespace prefixes.  See below.

A.xsd:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema.xsd">
 <xs:element name="foo"/>
</xs:schema>

B.xsd:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema.xsd"
           xmlns:me="urn:example"
           targetNamespace="urn:example">

 <xs:import schemaLocation="A.xsd"/>

 <xs:complexType name="baz">
  <xs:sequence>
   <xs:element ref="foo"/>
  </xs:sequence>
 </xs:complexType>

 <xs:element name="baz" type="me:baz"/>
</xs:schema>

Note in particular that the reference to foo is unqualified, because
unprefixed in the absence of a default namespace declaration.

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 Monday, 29 October 2001 13:53:06 GMT

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