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Re: Referencing attributes from the XMLSchema-instance namespace

From: Christopher Milton <cmiltonperl@yahoo.com>
Date: Thu, 1 Mar 2007 09:21:38 -0800 (PST)
To: xmlschema-dev@w3.org
Message-ID: <588281.80012.qm@web31806.mail.mud.yahoo.com>

Boris,

Look at the documentation for XML Schema:

http://www.w3.org/TR/xmlschema-1/#Instance_Document_Constructions

Chris


--- Boris Kolpackov <boris@codesynthesis.com> wrote:
> Hi,
> 
> Microsof's Print Schema[1] has a fragment that looks like so:
> 
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
>            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
> 
>   <xs:complexType name="Type" mixed="true">
>     <xs:attribute ref="xsi:type" use="required"/>
>   </xs:complexType>
> 
> <xs:schema>
> 
> 
> There is no import declaration for the xsi namespace. I am
> wondering whether this is legal or not. I can see three
> possible answers actually: (1) this schema is valid, (2) this
> schema is invalid but can be made valid by importing a schema
> that declares xsi:type:
> 
> 
> <schema targetNamespace="http://www.w3.org/2001/XMLSchema-instance"
>         xmlns="http://www.w3.org/2001/XMLSchema"
>         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
> 
> <attribute name="type" type="xs:QName"/>
> <attribute name="nil" type="xs:boolean"/>
> 
> </schema>
> 
> 
> And, finally, (3) referencing attributes from the xsi namespace
> in the definition is illegal.
> 
> 
> [1] http://www.microsoft.com/whdc/xps/printschema.mspx
> 
> 
> thanks,
> -boris
> 
> 
> --
> Boris Kolpackov
> Code Synthesis Tools CC
> http://www.codesynthesis.com
> Open-Source, Cross-Platform C++ XML Data Binding
> 
Received on Thursday, 1 March 2007 17:21:47 UTC

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