Defines an object that can observe changes to properties of a page and its components, store the state of the page between request cycles, and restore a page's state on a subsequent request cycle.
Concrete implementations of this can store the changes in memory, as client-side cookies, in a flat file, or in a database.
@author Howard Lewis Ship
@version $Id: IPageRecorder.java 243791 2004-02-19 17:38:13Z hlship $
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