How do I reference a definition and at the same time modify it?

[WilliamB]

New RELAX NG user here. So let's say I have the following definitions
in my RELAX NG schema:

<define name="DefineEle mentA">
<element name="ElementA" >
<interleave>

<optional>
<element name="ElementB" >
<text/>
</element>
</optional>

<optional>
<element name="ElementC" >
<text/>
</element>
</optional>

<optional>
<element name="ElementD" >
<text/>
</element>
</optional>

</interleave>
</element>
</define>

<define name="DefineEle mentE">
<interleave>
<ref name="DefineEle mentA"/>

<optional>
<element name="ElementF" >
<text/>
</element>
</optional>

</interleave>
</define>

I want the definition "DefineElementE " to reference the definition
"DefineElementA " like above, but I also want to change the referenced
definition in the context of "DefineElementE " so that element
"ElementD" is required. ElementE is sort of like a subclass of
ElementA: it inherits all of ElementA's child elements. Simply
duplicating ElementA's definition in ElementE and making ElementD
required would break inheritance. Is there another way?

William Beaumont