<?xml  version="1.0"?>
<!-- validity test for Production 60-->
<!DOCTYPE Java 
 [
 <!ELEMENT Java ANY>
 <!ELEMENT one EMPTY>
 <!ELEMENT two EMPTY>
 <!ATTLIST one chapter CDATA #REQUIRED>
 <!ATTLIST two chapter CDATA #REQUIRED>
 ]>
<Java>
<one chapter="Introduction"></one>
<two chapter="JavaApplets"></two>
Positive test. Required attribute. Every occurrence of an element with a 
#REQUIRED attribute default declaration gives the value of that attribute
</Java>