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http://issues.apache.org/jira/browse/XMLBEANS-299?page=comments#action_12457783 
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Erik van Zijst commented on XMLBEANS-299:
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> 1. Last time I looked at the issue, the validation actually worked, it was 
> just the binding that didn't work, are you saying that's not
> what you found?

Everytime I try it, the explicit validation I apply on the parsed document 
fails (MyDoc.Factory.parse() succeeds, but myDoc.validate() returns false). 
When I skip validation and just use the parsed document, it lacks all elements 
whose generated classes were in the extension jar. Instead, the getters return 
null.

> 2. Registering the extension Schemas explicitly in the code comes, in my 
> mind, against the direction of being able to have the
> substituions in the extended Schemas integrate seamlessly in the current 
> structure (the way everything else loads dinamically without
> needing to be known in advance).

I agree. Extensions on schemas and separately compiled stubs should integrate 
seemlessly. Therefore David's solution doe not work for me as I have no control 
over the extensions.


> Support substitution groups when the substitution is compiled in a different 
> jar
> --------------------------------------------------------------------------------
>
>                 Key: XMLBEANS-299
>                 URL: http://issues.apache.org/jira/browse/XMLBEANS-299
>             Project: XMLBeans
>          Issue Type: Improvement
>          Components: Binding
>    Affects Versions: Version 2.2, Version 2.2.1
>            Reporter: Radu Preotiuc-Pietro
>             Fix For: TBD
>
>
> XMLBeans doesn't currently support substitution groups where the head element 
> is compiled in a jar and the substitutions are compiled at a later time in a 
> different jar.
> Because XMLBeans doesn't have the opportunity to save in the serialized xsb 
> information about substitution groups (since these do not exist at the time 
> the xsb is created) then it is forced to assume that any element can be a 
> substitution for anything else and the only way to reliably tell is to load 
> the element declaration. But loading the element declaration each time two 
> elements are compared for QName equality is going to be very expensive even 
> if loaded from the cache. This whole thing will need to be enabled on-request 
> and have its separate codepath.

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