[news.eclipse.tools.emf] Is there a way to extend EFactories?

[paul.fullbright@xxxxxxxxxx (Paul Fullbright)]

I have to support several versions of a document, such as below:

foo_1_0.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema 
	targetNamespace="http://www.foo.com"; 
	xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
	version="1.0">
	<xsd:complexType name="foo">
		<xsd:sequence>
			<xsd:element name="name" type="xsd:string" minOccurs="0"/>
		</xsd:sequence>
	</xsd:complexType>
</xsd:schema>

foo_2_0.xsd:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xsd:schema 
	targetNamespace="www.foo.com"
	xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
	version="2.0">
	<xsd:redefine schemaLocation="foo_1_0.xsd">
		<xsd:complexType name="foo">
			<xsd:complexContent>
				<xsd:extension base="foo">
					<xsd:sequence>
						<xsd:element name="description" type="xsd:string" minOccurs="0"/>
					</xsd:sequence>
				</xsd:extension>
			</xsd:complexContent>
		</xsd:complexType>
	</xsd:redefine>
</xsd:schema>


As you can see, foo version 2 simply extends foo version 1.  I would 
*like* to be able to encapsulate creation of the foo EObject depending on 
which version of the document I'm dealing with (and I have to deal with 
both).  So it would be helpful if, in addition to model inheritance, I 
could have EFactory inheritance, such as:

public class FooFactory extends EFactoryImpl {
   ...
   Foo createFoo() {
   ...
}

public class Foov2Factory extends FooFactory {
   ...
   Foov2 create Foo() {   // where Foov2 extends Foo
   ...
}

I could thus have a foo creation scenario where all I have to do is 
retrieve the correct factory:

(client code)

   Foo buildFoo() {
       FooFactory factory = determineFactory();
       return factory.createFoo();
   }


Is such a thing possible?  Or is something similar possible?  The 
encapsulation of object creation is the key here for me.

Thanks,
Paul