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Re: Hiding namespace prefixes in the instance document

From: George Cristian Bina <george@oxygenxml.com>
Date: Wed, 04 Jan 2006 11:56:32 +0200
Message-ID: <43BB9BD0.8030606@oxygenxml.com>
To: Antti Sissonen <antti_sissonen@hotmail.com>
Cc: xmlschema-dev@w3.org

Hi Antti,

It seems a bug in how the generated document is created, for instance 
oXygen creates the following document if you give it the 
Importer_Schema.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<ImporterSchema xmlns="importer:schema:namespace"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="importer:schema:namespace Importer_Schema.xsd">
   <ImportedComplexType>
     <ImportedElement xmlns=""></ImportedElement>
   </ImportedComplexType>
</ImporterSchema>

As you can see the ImportedElement is correctly placed in no namespace 
by resetting the default namespace using xmlns="".

I think in general you should clarify what namespaces you want for your 
elements and then create the schema for them. There are a couple of 
things you should have clear in mind when you define elements. You can 
have in a schema global elements and local elements. The global elements 
belong to the schema target namespace. The local elements belong either 
to no namespace or to the schema target namespace depending on the 
element/@form attribute or if that is not present depending on the 
schema/@elementFormDefault attribute. If none of these are present the 
local elements belong to no namespace as the elementFormDefault 
attribute default value is unqualified.

In your case the ImportedElement is a local element and you have 
schema/@elementFormDefault="unqualified" so the ImportedElement is 
defined in no namespace.

Hope that helps,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


Antti Sissonen wrote:
> 
> Hi.
> 
> I have a schema that imports another one. Iím trying to keep the 
> namespace prefixes hidden in the xml instance and at the same time have 
> namespaces defined for both schemas. I assume that this is not possible 
> if both schemas have their own targetNamespaces.
> One way to do this would be the chameleon design, ie. use include 
> instead of import and have no namespace definition in the imported 
> schema. What are the downsides of this? Is the modularity somehow more 
> restricted?
> Is there possibly some other options that I'm not recognising?
> 
> 
> Enclosing schema:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
> xmlns="importer:schema:namespace" 
> xmlns:imported="imported:schema:namespace" 
> targetNamespace="importer:schema:namespace" elementFormDefault 
> ="qualified" attributeFormDefault="unqualified">
> <xs:import namespace="imported:schema:namespace" 
> schemaLocation="Imported_Schema.xsd"/>
> <xs:element name="ImporterSchema" type="ImporterType"/>
> 
>     <xs:complexType name="ImporterType">
>         <xs:sequence>
>             <xs:element name="ImportedComplexType" 
> type="imported:ImportedType" minOccurs="0"/>
>         </xs:sequence>
>     </xs:complexType>
> </xs:schema>
> 
> Imported (common component) schema:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
> xmlns:imported="imported:schema:namespace" 
> targetNamespace="imported:schema:namespace" 
> elementFormDefault="unqualified" attributeFormDefault="unqualified">
>     <xs:complexType name="ImportedType">
>         <xs:sequence>
>             <xs:element name="ImportedElement" type="xs:string" 
> minOccurs="0"/>
>         </xs:sequence>
>     </xs:complexType>
> </xs:schema>
> 
> Generated instance document (not valid though, why?):
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <!--Sample XML file generated by XMLSpy v2005 rel. 3 U 
> (http://www.altova.com)-->
> <ImporterSchema
> xmlns="importer:schema:namespace"
> xmlns:imported="imported:schema:namespace"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> xsi:schemaLocation="importer:schema:namespace Importer_Schema.xsd">
> 
>     <ImportedComplexType>
>         <ImportedElement>String</ImportedElement>
>     </ImportedComplexType>
> </ImporterSchema>
> 
> 
> 
> _________________________________________
> 
> Antti Sissonen [Antti_Sissonen@hotmail.com]
> 
> 
> 
> 
Received on Wednesday, 4 January 2006 09:54:52 GMT

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