yet another trang rng -> DTD question : namespaces

I don't want to see ungrateful :-}, but this, with  
ns="http://www.tei-c.org/ns/1.0",

  <define name="TEI">
    <element name="TEI">
      <ref name="content.TEI"/>
    </element>
  </define>

turns into this:

<!ELEMENT ns1:TEI (%content.TEI;)>
<!ATTLIST ns1:TEI
  xmlns:ns1 CDATA #FIXED 'http://www.tei-c.org/ns/1.0'
  %attributes.TEI;>

which "traditional" XML parsers seem unable to cope with, as they don't 
understand
namespaces in DTDs. Are they mistaken?

Sebastian