XML unmarshalling - key and keyRef

> I'd like to unmarshal a given document which uses references to arbitrary
> elements via an unique attribute. Example:
>
> <root>
> <a no="1"/>
> <b no="2"/>
> <c no="3" refTo="1"/>
> <c no="4" refTo="2"/>
> <c no="5" refTo="3"/>
> </root>
>
> Unfortunately I couldn't figure out a working binding specification. My
> last attempt used an artificial general type<object name="xxx"... and
> derived<object name="a" baseType="xxx"... and the other objects from
> this. That general defined the key "no". However, the references haven't
> been resolved at all.

> Hi,
>
> given two classes, ArbitraryList (with instVar accessors #elements) and
> ArbitraryElement (with accessors #number and #referencedElement), the
> following XML binding will unmarshal the arbitrary elements including
> the references:
>
> <xmlToSmalltalkBinding name="ArbitrayList"
>    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>  >
>
> <object name="root" smalltalkClass="ArbitraryList">
>    <element aspect="elements" xpath="*" ref="arbitraryElement"
> minOccurs="0" maxOccurs="*"/>
> </object>
>
> <object name="arbitraryElement" smalltalkClass="ArbitraryElement">
>    <key name="elementKey">
>      <attribute aspect="number" name="no" ref="xsd:integer"/>
>    </key>
>    <attribute aspect="number" name="no" ref="xsd:integer"/>
>    <attribute aspect="referencedElement" name="refTo"
> ref="arbitraryElement" minOccurs="0">
>      <keyRef ref="elementKey" >
>        <attribute name="refTo" ref="xsd:integer"/>
>      </keyRef>
>    </attribute>
> </object>
>
> </xmlToSmalltalkBinding>
>
>
>> I'd like to unmarshal a given document which uses references to  
>> arbitrary
>> elements via an unique attribute. Example:
>>
>> <root>
>> <a no="1"/>
>> <b no="2"/>
>> <c no="3" refTo="1"/>
>> <c no="4" refTo="2"/>
>> <c no="5" refTo="3"/>
>> </root>
>>
>> Unfortunately I couldn't figure out a working binding specification. My
>> last attempt used an artificial general type<object name="xxx"... and
>> derived<object name="a" baseType="xxx"... and the other objects from
>> this. That general defined the key "no". However, the references haven't
>> been resolved at all.
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>
> looks good so far but in this example the elements<a>,<b>,<c>  are all
> unmarshalled to the class ArbitraryElement. In my case I need to unmarshal
> them to 3 different classes, say ClassA, ClassB and ClassC. Is there a way
> to achieve this?
> To talk more general, I have an XML where almost each element has an
> unique attribute, say 'no'. Certain elements may reference arbitrary
> elements via an attribute, say 'refTo' and it's possible that element<a>
> references at one position<b>  and at another element<c>. But<a>,<b>
> and<c>  need to be unmarshalled to different classes.