From An Introduction to XML Basic Information Track Computational Science Course CPS616 -- Spring Semester 1999. byNancy McCracken,Ozgur Balsoy, Tom Scavo
The rules for attribute declarations follow a similar structure to elements. <!ATTLIST person gender (male|female)#IMPLIED >
ATTLIST is the type
person is the element
gender is the attribute declaration
(male|female)#IMPLIED is the attribute definition
The keywords following an attribute definition can be
#IMPLIED attribute is optional
"unknown" string in quotes is the default attribute
#REQUIRED attribute is required
#FIXED if attribute is present, it is assigned a fixed value
