<?xml  version="1.0"?>
<!-- validity constraint check for Production 56(Negative Test)-->
<!DOCTYPE tokenizer
 [
 <!ELEMENT tokenizer ANY>
 <!ATTLIST tokenizer UniqueName ID "BOGUS">
 ]>
<tokenizer UniqueName = "AC1999">
This is a Negative validity test for ID Attribute Default.
Giving the attibute default as a const string
</tokenizer>