<?xml  version="1.0"?>
<!-- syntax test for Production 63-->
<!DOCTYPE animal SYSTEM "ibm63n01.dtd"
[
<!ELEMENT animal ANY>
<!ELEMENT tiger (#PCDATA)>
<!ATTLIST animal a (tiger) #REQUIRED> 
]>
<animal a = "TIGER1">
Negative test. Case sensitive(ignore is used instead of IGNORE).
</animal>