8. A method according to claim 7 , wherein the contextual relationship is selected from the group consisting of a relative rendered position of the graphical tool and rendered portions of the content document, a time at which the graphical tool acts on rendered portions of the content document, and a state of rendered portions of the content document.
7. A method according to claim 6 , wherein the derived document changes according to a contextual relationship among the graphical tool, the content document, and an application program in which the tool document file is used.