<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
    <start>
        <ref name="rootElement"></ref>
    </start>
   
    <define name="rootElement">
        <element>
            <anyName>
                <except>
                    <nsName ns="http://interestingElements.com"></nsName>
                </except>                   
            </anyName>
            <ref name="children"></ref>
        </element>
    </define>

…

Aside from this example, how would this approach work for interesting elements that are in the same namespace as the base schema?