<?xml version="1.0"?>
<!DOCTYPE student [
<!ELEMENT student (#PCDATA)>
<!ATTLIST student
first CDATA #REQUIRED
middle CDATA #IMPLIED
last CDATA #IMPLIED >
<!ENTITY myfirst "Snow">
<!ENTITY mymiddle "I">
<!ENTITY mylast "Man">
]>
<!-- testing invalid attvalue with no closing bracket -->
<student first="Snow >My Name is SnowMan. </student>
|