ENUMERATED (the keyword is not actually used)

Attributes can also be defined by a list of acceptable pipe delimited values from which the document author must choose.

Note that in the example below, CHICKEN is assumed by default if no TYPE is specified.

<?xml version = "1.0" 
         encoding="UTF-8" 
         standalone = "yes"?>
<!DOCTYPE GROCERY_BASKET [
	<!ELEMENT GROCERY_BASKET ANY>
	<!ELEMENT MEAT EMPTY>
	<!ATTLIST MEAT TYPE (CHICKEN | 
			BEEF | 
			PORK | 
			FISH) "CHICKEN">
	]>
<GROCERY_BASKET>
<MEAT TYPE = "FISH"/>
<MEAT TYPE = "BEEF"/>
<MEAT/>
</GROCERY_BASKET>

CDATA TYPE
Introduction to XML For Web Developers | Table of Contents
ID and IDREF