Elements that have ATTLIST tags contain attributes (name-value pairs). For example:
<!ATTLIST cachemax-capacity CDATA "4096" timeout CDATA "30" enabled %boolean; "false"> A cache element can contain max-capacity, timeout, and enabled attributes.
The #REQUIRED label means that a value must be supplied. The #IMPLIED label means that the attribute is optional, and that Web 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.