<?xml  version="1.0"?>
<!-- valid test for Production 57-->
<!DOCTYPE root
 [
 <!ELEMENT root (#PCDATA|a|b)*>
 <!ELEMENT a ANY>
 <!ELEMENT b ANY>
 <!NOTATION a SYSTEM "a">
 <!NOTATION b SYSTEM "b"> 
 <!ATTLIST a att (a|b) #IMPLIED>
 <!ATTLIST b att NOTATION (a|b) #IMPLIED>
 ]>
 <root>
This test case tests the kinds of enumerated types
<a/><b/>
</root>