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Re: Unknown prefix xml?

From: Martin Gudgin <marting@develop.com>
Date: Mon, 29 Jan 2001 11:22:34 -0000
Message-ID: <001c01c089e5$c8687960$0200a8c0@develop.com>
To: "Eric van der Vlist" <vdv@dyomedea.com>
Cc: "XML Schema Dev" <xmlschema-dev@w3.org>
Follow up...

Strangely mapping http://www.w3.org/XML/1998/namespace to some arbitrary prefix like ppp works just
fine[4]

Gudge

[4] http://marting.develop.com/xsd/xmlspace2.xsd

----- Original Message -----
From: "Eric van der Vlist" <vdv@dyomedea.com>
To: "Martin Gudgin" <marting@develop.com>
Cc: "XML Schema Dev" <xmlschema-dev@w3.org>
Sent: Monday, January 29, 2001 11:06 AM
Subject: Re: Unknown prefix xml?


> Martin Gudgin wrote:
> >
> > Just to be sure... You are saying I have to put
> >
> >     xmlns:xml='http://www.w3.org/XML/1998/namespace'
> >
> > in my schema document?
>
> Yes.
>
> > That seems very weird. The xml namespace prefix is always in scope, why
> > should I have to declare it.
>
> My take on this is that W3C XML Schema is trying to kill 2 birds with a
> single declaration.
>
> When you write xmlns:foo="http://bar" in a schema, you do 2 different
> things:
>
> 1) you declare a namespace prefix per the namespaces in XML 1.0 rec
> that, most of the time, you will not use as a namespace prefix.
>
> 2) you declare to the schema processor that you will be using the prefix
> 'foo' inside W3C XML Schema attributes to identify the namespace
> "http://bar".
>
> The xml namespace prefix is always in your scope per the namespace rec
> to perform 1), but not ins your scope to perform 2).
>
> > MSXML sees this as an error, complaing that the prefix xml is invalid.
> > Xerces and Oracle accept it. Either way it doesn't solve my problem. A modified schema with the
> > above declaration still gives the same error[3]
>
> I am confused with your schema. It has no global element definition...
> Is it intended to be included in another one ? Otherwise I don't see
> which instance document can be validated ? Could you provide one ?
>
> Eric
>
> > Gudge
> >
> > [3] http://marting.develop.com/xsd/xmlspace.mod.xsd
> >
> > ----- Original Message -----
> > From: "Eric van der Vlist" <vdv@dyomedea.com>
> > To: "Martin Gudgin" <marting@develop.com>
> > Cc: "XML Schema Dev" <xmlschema-dev@w3.org>
> > Sent: Monday, January 29, 2001 9:27 AM
> > Subject: Re: Unknown prefix xml?
> >
> > > Martin Gudgin wrote:
> > > >
> > > > I'm getting an 'attribute type check failed for {None}:ref: xml:space has undeclared prefix:
> > xml'
> > > > error using XSV1.1a with the schema at[1]. Full XSV output is at[2].
> > > >
> > > > I don't *think* I should have to declare the xml prefix inside my schema, should I?
> > >
> > > Yes you have ;=) ...
> > >
> > > You need to define its namespace as
> > > "http://www.w3.org/XML/1998/namespace".
> > >
> > > You don't **need** to specify a schame location for this namespace since
> > > a schema validator will find a schema for this namespace by
> > > dereferencing the URI.
> > >
> > > If you don't specify a schema location, it will mean though that your
> > > schema processor will perform an access to this location each time it
> > > validates the schema (unless it's using a cache).
> > >
> > > Erix
> > >
> > > > Gudge
> > > >
> > > > [1] http://marting.develop.com/xsd/xmlspace.xsd
> > > > [2] http://marting.develop.com/xsd/xmlspace.err.xml
> > >
> > > --
> > > ------------------------------------------------------------------------
> > > Eric van der Vlist       Dyomedea                    http://dyomedea.com
> > > http://xmlfr.org         http://4xt.org              http://ducotede.com
> > > ------------------------------------------------------------------------
>
> --
> ------------------------------------------------------------------------
> Eric van der Vlist       Dyomedea                    http://dyomedea.com
> http://xmlfr.org         http://4xt.org              http://ducotede.com
> ------------------------------------------------------------------------
Received on Monday, 29 January 2001 06:23:31 GMT

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