Dear Mike,

I left it out for brevity. Here is the (extremely simple) schema C-ns.xsd:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="C-namespace" xmlns="C-namespace">
	
    <xs:element name="C"></xs:element>
    <xs:attribute name="C_Attribute"/>
	
</xs:schema>

It just defines a new element and attribute in the C-namespace.

With best regards,

Jozef Aerts
XML4Pharma

===========================


One of your schema document imports C-ns.xsd, but you haven't supplied
anything with this name.

Michael Kay
http://www.saxonica.com/ 

> -----Original Message-----
> From: xmlschema-dev-request@w... 
> [mailto:xmlschema-dev-request@w...] On Behalf Of XML4Pharma
> Sent: 26 September 2008 09:04
> To: xmlschema-dev@w...
> Subject: redefine of redefine in series of schemas
> 
> 
> I have a schema wich defines an element A in namespace "A-namespace".
> I made it so that the A-element is extensible with child 
> elements and attributes from another namespace, so that I can 
> have e.g.
> 
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <A xmlns="A-namespace" xmlns:b="B-namespace" b:B_Attribute="Hallo">
>     <b:B/>
> </A>
> 
> My schemas for the A-namespace are:
> 
> A.xsd:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema targetNamespace="A-namespace" xmlns="A-namespace" 
> xmlns:xs=http://www.w3.org/2001/XMLSchema
> elementFormDefault="qualified" attributeFormDefault="unqualified">
>     <!-- include base schema -->
>     <xs:include schemaLocation="A-ns.xsd"/>
> </xs:schema>
> 
> and A-ns.xsd:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> targetNamespace="A-namespace" xmlns="A-namespace" 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> 
> <!-- attributes to A element -->
> <xs:attributeGroup name="A_AttributeDefinition">
>     <xs:attribute name="A_Attribute"/>
> </xs:attributeGroup>
> 
> <!-- allow extension attributes to A element -->
> <xs:attributeGroup name="A_AttributeExtension"></xs:attributeGroup>
> 
> <!-- allow extension child elements to A element -->
> <xs:group name="A_ElementExtension"><xs:sequence/></xs:group>
> 
> <!-- A element complexType definition -->
> <xs:complexType name="MycomplexTypeDefinition-A">
>     <xs:sequence>
>         <xs:group ref="A_ElementExtension" minOccurs="0" 
> maxOccurs="unbounded"/>
>     </xs:sequence>
>     <xs:attributeGroup ref="A_AttributeDefinition"/>
>     <xs:attributeGroup ref="A_AttributeExtension"/>
> </xs:complexType>
> 
> <!-- A element definition -->
> <xs:element name="A" type="MycomplexTypeDefinition-A"/>
> 
> </xs:schema>
> 
> For the B-namespace I have the following schemas:
> - B.xsd is the main schema
> - B-ns.xsd defines the elements of attributes of namespace 
> "B-namespace"
> - B-extensionToA.xsd defines how the elements/attributes from the 
> B-namespace may be added to those of the A-namespace.
> 
> B.xsd:
> 
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <xs:schema targetNamespace="A-namespace" xmlns="A-namespace" 
> xmlns:xs=http://www.w3.org/2001/XMLSchema xmlns:b="B-namespace" 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> 
> <xs:include schemaLocation="B-extensionToA.xsd"/>
> 
> </xs:schema>
> 
> B-ns.xsd:
> 
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <xs:schema targetNamespace="B-namespace" 
> xmlns="http://www.w3.org/2001/XMLSchema" 
> xmlns:xs=http://www.w3.org/2001/XMLSchema xmlns:b="B-namespace" 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> 
> <!-- define a B element that is extensible -->
> 
> <!-- attributes to B element - definition -->
> <xs:attributeGroup name="B_AttributeDefinition">
>     <xs:attribute name="B_Attribute"/> <!-- defines a simple 
> attribute 
> "B_Attribute" -->
> </xs:attributeGroup>
> 
> <!-- allow extension attributes to B element -->
> <xs:attributeGroup name="B_AttributeExtension"></xs:attributeGroup>
> <!-- allow extension child elements to B element -->
> <xs:group name="B_ElementExtension"><xs:sequence/></xs:group>
> 
> <!-- B element complexType definition -->
> <xs:complexType name="MycomplexTypeDefinition-B">
>     <xs:sequence>
>     <xs:group ref="b:B_ElementExtension" minOccurs="0" 
> maxOccurs="unbounded"/>
>     </xs:sequence>
>     <xs:attributeGroup ref="b:B_AttributeDefinition"/>
>     <xs:attributeGroup ref="b:B_AttributeExtension"/>
> </xs:complexType>
> 
> <!-- B element definition -->
> <xs:element name="B" type="b:MycomplexTypeDefinition-B"/>
> </xs:schema>
> 
> B_ExtensionToA.xsd:
> 
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <xs:schema targetNamespace="A-namespace" xmlns="A-namespace" 
> xmlns:b="B-namespace" xmlns:xs=http://www.w3.org/2001/XMLSchema 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> 
> <!-- allow to use elements from the B-namespace in elements from the 
> A-namespace -->
> <xs:import namespace="B-namespace" schemaLocation="B-ns.xsd"/>
> 
> <!-- add extensions to A schema -->
> <xs:redefine schemaLocation="A.xsd">
> 
> <!-- allow an attribute B_Attribute to the A element -->
> <xs:attributeGroup name="A_AttributeExtension">
> <xs:attributeGroup ref="A_AttributeExtension"/>
>     <xs:attribute ref="b:B_Attribute"/>
> </xs:attributeGroup>
> 
> <!-- allow B element to be a child element of A -->
> <xs:group name="A_ElementExtension">
>     <xs:sequence>
>         <xs:group ref="A_ElementExtension"/>
>         <xs:element ref="b:B" minOccurs="0"/>
>     </xs:sequence>
> </xs:group>
> </xs:redefine>
> 
> </xs:schema>
> 
> This works great !
> 
> Now comes the difficult part:
> 
> I need to make the elements of as well the A-namespace as the 
> B-namespace 
> extensible so that I can add elements/attributes to A-elements and 
> B-elements from a third namespace, the "C-namespace".
> 
> So I use the same mechanism in the B-namespace as I did for 
> the A-namespace 
> (see B-ns.xsd above).
> 
> So for the C-extension schema C-extensionToB.xsd I write:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs=http://www.w3.org/2001/XMLSchema 
> targetNamespace="A-namespace"  xmlns="A-namespace" 
> xmlns:b="B-namespace" 
> xmlns:c="C-namespace">
> 
> <!-- import elements from C-namespace -->
> <xs:import namespace="C-namespace" schemaLocation="C-ns.xsd"/>
> <!--xs:import namespace="B-namespace" schemaLocation="B-ns.xsd"/-->
> 
> 
> <xs:redefine schemaLocation="B-extensionToA.xsd">
>     <!-- Add C element to A element -->
>     <xs:group name="A_ElementExtension">
>         <xs:sequence>
>             <xs:group ref="A_ElementExtension"/>
>             <xs:element ref="c:C"/>
>         </xs:sequence>
>     </xs:group>
> 
>     <!-- Add C element to B element --><!-- causes problems -->
>     <xs:group name="B_ElementExtension">
>         <xs:sequence>
>             <xs:group ref="B_ElementExtension"/>
>             <xs:element ref="c:C"/>
>         </xs:sequence>
>     </xs:group>
> </xs:redefine>
> 
> </xs:schema>
> 
> With this I can add elements/attributes from the C-namespace 
> to elements of 
> the A-namespace, e.g.
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <A xmlns="A-namespace" xmlns:b="B-namespace" xmlns:c="C-namespace" 
> b:B_Attribute="Hallo">
>     <b:B/>
>     <c:C/>
> </A>
> 
> I can however NOT add elements from the C-namespace to those of the 
> B-namespace.
> 
> For example, the following seems not to be possible - I get 
> an error "cannot 
> resolve the name 'B_ElementExtension_....." to a 'group' component
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <A xmlns="A-namespace" xmlns:b="B-namespace" xmlns:c="C-namespace" 
> b:B_Attribute="Hallo">
>     <b:B>
>         <c:C/>
>     </b:B>
>     <c:C/>
> </A>
> 
> It looks as using the "redefine" mechanism, it is only 
> possible to add 
> elements/attributes to elements of the namespace that is the 
> "targetNamespace".
> 
> The problem seems to be in the snippet in the C_ExtensionToB.xsd:
> 
> <xs:group name="B_ElementExtension">
>     <xs:sequence>
>         <xs:group ref="B_ElementExtension"/>
>         <xs:element ref="c:C"/>
>     </xs:sequence>
> </xs:group>
> 
> i.e. I am trying to add a C-element to an element in the 
> B-namespace that is 
> not the targetNamespace.
> 
> So my question: is there another way to make this possible ?
> 
> Of course I could make a single XSD (or a small set) to have 
> all this, but 
> there are some requirements from my employer:
> - all the schemas for the A-namespace must reside in a single 
> directory
> - all the schemas for the B-namespace must reside in another single 
> directory. This directory may not contain any copies of 
> schemas from the 
> A-directory
> 
> Until here, no problem. The next requirements is:
> - all the schemas for the C-namespace must reside in a third 
> directory. No 
> copies of schemas from the A-directory nor from the 
> B-directory may be 
> present.
> I.e. the C-schemas should use (unaltered) schemas from the A- and 
> B-directory directly
> 
> The idea behind these requirements is that we have a fixed 
> library of A- and 
> B-Schemas, and that schema developers can define totally 
> different schemas 
> that have elements/attributes that extend as well the A- as 
> B- elements.
> 
> The top element of all the instance documents will however 
> ALWAYS be in the 
> A-namespace.
> 
> Any proposals how this can be accomplished are very welcome.
> 
> Jozef
> 
> Jozef Aerts
> 
> XML4Pharma
> 
> 
> 
>

From mike@s... Mon Sep 29 11:18:34 2008
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