Mike
You said "They all have the
default unprefixed namespace as XML Schema's namespace." Technically
your schema doesn't, it is using a different namespace.
xmlns="http://www.ogf.org/dfdl/dfdl-1.0/XMLSchemaSubset"
I assume this is the standard 2001 XMLSchema namespace but cut-down so
as to include just the constructs DFDL uses in its subset?
Your namespace is not formally defined
in the DFDL spec, and no such xsd is freely available at that URL, so your
schema is not portable and fails to validate.
It also means that you can't strip out
all the DFDL stuff and leave a pure XML Schema that any schema processor
can handle.
Should we make your schema generally
available at that URL, so it is resolved by schema processor?
The IBM implementation does not define
such a subset, it just uses the standard 2001 XMLSchema namespace
"http://www.w3.org/2001/XMLSchema",
and then does extra checking to flag constructs and types that are not
in the DFDL subset. More work, but with all DFDL stuff removed the result
is a pure XML Schema.
If I change your schema below to use
the standard 2001 XMLSchema namespace then the IBM schema validator
gives the following error...
CTDX1100E
: XSD: Type reference 'http://www.w3.org/2001/XMLSchema#bar' is unresolved
...because it is looking in the 2001
XMLSchema namespace xsd for "bar".
Regards
Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF
DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848
From:
Suman Kalia <kalia@ca.ibm.com>
To:
Mike Beckerle <mbeckerle.dfdl@gmail.com>
Cc:
dfdl-wg@ogf.org, dfdl-wg-bounces@ogf.org
Date:
19/03/2012 03:25
Subject:
Re: [DFDL-WG]
XML Schema do type references have to be qualified?
Sent by:
dfdl-wg-bounces@ogf.org
Mike - In the absence of explicit qualification, you cannot unambiguously
say whether type bar is in your namespace or notarget namespace. It
should be flagged as an error in my opinion...
From: Mike
Beckerle <mbeckerle.dfdl@gmail.com>
To: dfdl-wg@ogf.org
Date: 03/16/2012
05:04 PM
Subject: Re:
[DFDL-WG] XML Schema do type references have to be qualified?
Sent by: dfdl-wg-bounces@ogf.org
So, I did some research, and answered my own question.
Section 3.3.4.2 of "Definitive XML Schema" by Walmsley, says
that the
schema below is illegal as the name
"bar" will be interpreted as a reference to xsd:bar, not the
targetNamespace.
However, it seems many XML Schema processors may be tolerant of this error.
On Fri, Mar 16, 2012 at 4:48 PM, Mike Beckerle <mbeckerle.dfdl@gmail.com>
wrote:
> Suman,
>
> In and XMLSchema/DFDLSchema do I have to qualify the names of types?
>
> We have a bunch of test schemas written roughly like the example
> below. They all have the default unprefixed namespace as XML Schema's
> namespace. They also all have a target namespace.
>
> But some or all of the type references to named types use unqualified
> names. In my mind, that means they would be assumed to be in the XML
> Schema namespace, not the targetNamespace.
>
> On the other hand, the XML Schema validator doesn't complain. But
that
> just means the schema is valid, not necessarily meaningful.
>
> Example here:
>
> <schema xmlns="http://www.ogf.org/dfdl/dfdl-1.0/XMLSchemaSubset"
> targetNamespace="http://example.com">
> <element name="foo" type="bar"/><!--
IS THIS LEGAL, no prefix on name> of the type. -->
> <complexType name="bar">
> <sequence/>
> </complexType>
> </schema>
>
>
> Mike Beckerle | OGF DFDL WG Co-Chair
> Tel: 781-330-0412
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
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