<?xml encoding='US-ASCII'?>

<!ELEMENT sxe    elem1, elem 11>
<!ATTLIST sxe    id     CDATA  #implied>

<!ELEMENT elem1  elem2>
<!ATTLIST elem1  attr1  CDATA  #required
                 attr2  CDATA  "default>

<!ELEMENT elem2  elem3>
<!ATTLIST elem2>

<!ELEMENT elem3  elem4>
<!ATTLIST elem3>

<!ELEMENT elem4  EMPTY>
<!ATTLIST elem4>

<!ELEMENT elem11 EMPTY>
<!ATTLIST elem11>