1  <?xml version="1.0"?>
 2  <Foo
 3  	xmlns="urn:test:foo"
 4  	xmlns:foo="urn:test:foo"
 5  	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 6  	xsi:schemaLocation="urn:test:foo idc-keyref_1.xsd">
 7  
 8      <Def>
 9          <Link foo:linkKey="L4"/>
10      </Def>
11  
12      <Ref foo:linkRef="L4"/>
13  
14  </Foo>