--- /dev/null
+<?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>