<?xml version="1.0"?>

   <schema uri="urn:x-commerceone:document:com:commerceone:XCBL30:XCBL30.sox$1.0">

      <elementtype name="PayerParty">
         <extends type="Party">
            <append>
               <element type="string" name="CertificateAuthority" occurs="?"/>
            </append>
         </extends>
      </elementtype>

   </schema>