Re: [xml-dev] Can schemas be in the default namespace?

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

At 2015-05-05 14:15 +0200, Steinar Bang wrote:
> Is it legal to do this?
>   <schema xmlns="http://www.w3.org/2001/XMLSchema";>
>     ...
>   </schema>
Yes.

> I'm dealing with some schemas that don't use a namspace prefix for the
> schema namespace, ie. they are defined like this:
>  <schema xmlns:xsd="http://www.w3.org/2001/XMLSchema.xsd"; 
> xmlns="http://www.w3.org/2001/XMLSchema"; 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
>
> Ie. they have set xmlns="http://www.w3.org/2001/XMLSchema"; (and
> xmlns:xsd="http://www.w3.org/2001/XMLSchema.xsd"; as well, though the
> "xsd:" prefix isn't used anywhere I could see).
Not a problem.

> XML Validator Buddy[1] didn't complain about this, but eclipse WTP[2]
> (WTP 3.6.3 on Luna SR2) on
>  <import namespace="http://www.myorg.no/xmlstds"; 
> schemaLocation="../common/myorg.xsd"/>
> gives the following error message
>  schema_reference.4: Failed to read schema document 
> '../common/myorg.xsd', because 1) could not find the document; 2) 
> the document could not be read; 3) the root element of the document 
> is not 
> <xsd:schema>.  ER-M30-2014-12-01.xsd   /MYProject/Myfolder     line 
> 13 XML Schema Problem
That sounds like a bug as if they were expecting prefix-based properties.

> The XSLT-based XSD to RNG converter[3] says:
>  error on line 11 at column 37: xml namespace URI cannot be the 
> default namespace
I understand the wording of that message to be talking about the 
namespace used for xml:space= and xml:lang=, not the namespace for 
XSD.  One isn't allowed to declare the namespace for the "xml:" prefix.

> Who are right?  Is it possible to tickle the schemas so that WTP and/or
> the XSLT converter will accept them?
"Tickle"?  No ... wholesale edit removing the use of the default 
namespace in order to accommodate a buggy validator.

> Is the problem that both the outer schema and the imported schema 
> uses "xmlns="?
It is difficult to understand the "bug emulation mode" of a 
non-conformant processor.

I hope this helps.

. . . . . . Ken

> Thanks!
>
>
> - Steinar
>
> [1] http://www.xml-buddy.com/ValidatorBuddy.htm
> [2] http://www.eclipse.org/webtools/phoenix/webtools/
> [3] http://debeissat.nicolas.free.fr/XSDtoRNG.php

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