<?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 "Y">
	<!ENTITY mylast ''>
]>
<!-- testing AttValue with empty char inside single quote -->
<student first='' last=''>My Name is Snow &mylast; Man. </student>