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