<?xml version="1.0"?>
<!DOCTYPE student [
	<!ELEMENT student (#PCDATA)>
	<!ATTLIST student
		first CDATA #REQUIRED
		middle CDATA #IMPLIED
		last CDATA #REQUIRED > 
	<!ENTITY myfirst 'Snow'>
	<!ENTITY mymiddle 'I'>
	<!ENTITY mylast "Man'">
]>
<!-- testing AttValue string with a single quote inside -->
<student first="Snow'" last="Man">My Name is &myfirst; &mylast;. </student>