8. A method comprising: in at least one memory device, instantiating a first packaged file presentation shell of a page description language document within a page description language document application executing on at least one processor of a computing device, the first packaged file presentation shell including standardized graphical elements including one or more packaged file presentation nodes, each standardized graphical element including properties; applying a presentation overlay to the instantiated first packaged file presentation shell, the presentation overlay including at least one standardized graphical element, which, when applied to the first packaged file presentation shell, overrides respective standardized graphical element properties including respective packaged file presentation nodes that each represent a packaged file within the page description language document; and presenting, via the page description language document application, a view of at least a portion of the page description language document according to (1) metadata associating each packaged file with the respective packaged file presentation node of the first packaged file presentation shell, and (2) the first packaged file presentation shell as modified by the presentation overlay, wherein the presentation overlay modifies only the first packaged file presentation shell when the at least the portion of the page description language document is presented.
8. A method comprising: in at least one memory device, instantiating a first packaged file presentation shell of a page description language document within a page description language document application executing on at least one processor of a computing device, the first packaged file presentation shell including standardized graphical elements including one or more packaged file presentation nodes, each standardized graphical element including properties; applying a presentation overlay to the instantiated first packaged file presentation shell, the presentation overlay including at least one standardized graphical element, which, when applied to the first packaged file presentation shell, overrides respective standardized graphical element properties including respective packaged file presentation nodes that each represent a packaged file within the page description language document; and presenting, via the page description language document application, a view of at least a portion of the page description language document according to (1) metadata associating each packaged file with the respective packaged file presentation node of the first packaged file presentation shell, and (2) the first packaged file presentation shell as modified by the presentation overlay, wherein the presentation overlay modifies only the first packaged file presentation shell when the at least the portion of the page description language document is presented. 12. The method of claim 8 , wherein at least one graphical element of the presentation overlay, which when applied, invokes one or more methods of an application plug-in executable on the at least one processor to be operable within the page description language document application.