Elements that have ATTLIST tags contain attributes (name-value pairs). For example:
<!ATTLIST ACLFILE
id ID #REQUIRED
file CDATA #REQUIRED
An ACLFILE element can contain id, and file attributes.
The #REQUIRED label means that a value must be supplied. The #IMPLIED label means that the attribute is optional, and that Sun Java System Web Proxy Server generates a default value. Wherever possible, explicit defaults for optional attributes (such as “true”) are listed.
Attribute declarations specify the type of the attribute. For example, CDATA means character data, and %boolean is a predefined enumeration.