thierry wrote:
> Hello,
> 
> I would like to understand the difference between FIRST
> 
> <?xml version="1.0" encoding="iso-8859-1"?>
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>                        targetNamespace="http://domaine.tld"
>                        xmlns="http://domaine.tld">
> 
>        <xsd:element name="serveur" type="xsd:string" />
>        <xsd:element name="definition">
>                <xsd:complexType>
>                        <xsd:all>
>                                <xsd:element ref="serveur" minOccurs
> ="1" maxOccurs ="1" />
>                        </xsd:all>
>                </xsd:complexType>
>        </xsd:element>
> </xsd:schema>
> 
> which validate
> 
> <?xml version="1.0" encoding="utf-8"?>
> <definition xmlns="http://domaine.tld">
>  <serveur>serveur1</serveur>
> </definition>
> 
> AND SECOND
> 
> <?xml version="1.0" encoding="iso-8859-1"?>
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>                        targetNamespace="http://domaine.tld"
>                        xmlns="http://domaine.tld">
> 
>        <xsd:element name="definition">
>                <xsd:complexType>
>                        <xsd:all>
>                                <xsd:element name="serveur" minOccurs
> ="1" maxOccurs ="1" />
>                        </xsd:all>
>                </xsd:complexType>
>        </xsd:element>
> </xsd:schema>
> 
> which validate
> 
> <?xml version="1.0" encoding="utf-8"?>
> <definition xmlns="http://domaine.tld">
>  <serveur xmlns="">anyType</serveur>
> </definition>
> 
> The difference is the xmlns attribute in the serveur tag of the second
> xml file.

The xsd:schema element takes an attribute
   elementFormDefault
which can take the value 'unqualified' or 'qualified'. See 
http://www.w3.org/TR/xmlschema-0/#QualLocals.

If you don't specify the attribute, as it is the case in your schemas, 
it takes on the value 'unqualified' meaning any local/inline definitions 
define elements in no namespace. That is why you need to put the 
xmlns="" on your "serveur" element. If you don't want to do that but 
rather define that elements in the targetNamespace of the schema you can use

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                        targetNamespace="http://domaine.tld"
                        xmlns="http://domaine.tld"
                        elementFormDefault="qualified">

        <xsd:element name="definition">
                <xsd:complexType>
                        <xsd:all>
                                <xsd:element name="serveur" minOccurs
="1" maxOccurs ="1" />
                        </xsd:all>
                </xsd:complexType>
        </xsd:element>
</xsd:schema>


-- 

	Martin Honnen --- MVP XML
	http://msmvps.com/blogs/martin_honnen/