||Representation of a Decorator.
||The DecoratorMapper is responsible for determining which
Decorator should be used for a
||Extension of Page providing access to HTML data.
||The Page object wraps the contents of the original (undecorated) page.
||The PageParser is responsible for parsing the page data into an appropriate
||A set of static constants of Strings to be used as ServletRequest attribute keys
to represent various objects passed between pages.