<?xml encoding='US-ASCII'?> <!ELEMENT sxe (elem1+, elem11, elem22*)> <!ATTLIST sxe id CDATA #implied> <!ELEMENT elem1 elem2*> <!ATTLIST elem1 attr1 CDATA #required attr2 CDATA "default> <!ELEMENT elem2 elem3*> <!ATTLIST elem2 att25 CDATA #implied att42 CDATA #implied> <!ELEMENT elem3 elem4*> <!ATTLIST elem3> <!ELEMENT elem4 EMPTY> <!ATTLIST elem4> <!ELEMENT elem11 elem111*> <!ATTLIST elem11> <!ELEMNET elem111 elem1111*> <!ATTLIST elem111> <!ELEMENT elem1111 EMPTY> <!ATTLIST elem1111> <!ELEMENT elem22 elem222*> <!ATTLIST elem22 attr22 CDATA #implied> <!ELEMENT elem222 EMPTY> <!ATTLIST elem222>