<!ELEMENT note (toe, from, heading, body)>
<!ELEMENT toe (toesub)>
<!ENTITY props 
 SYSTEM "http://www.donkeydevelopment.com/xmlspear/lib/XMLSpear.properties">
<!ELEMENT from (#PCDATA)>
<!ELEMENT heading (#PCDATA)>
<!ELEMENT body (#PCDATA)>
<!ATTLIST heading
      aaa CDATA #REQUIRED
      bbb CDATA #IMPLIED>
<!ATTLIST toe 
      ccc CDATA #REQUIRED
      ddd CDATA #IMPLIED>
<!ELEMENT toesub (#PCDATA)>