## Classes
| Class | Description |
| :- | :- |
| [`BeforePageSavingEventHandler`](/page/python-net/aspose.page.xps.features.eventbasedmodifications/beforepagesavingeventhandler/) | The base class for before-page-saving event handlers. |
| [`IModificationAPI`](/page/python-net/aspose.page.xps.features.eventbasedmodifications/imodificationapi/) | The basic interface for any XPS element's modification API. |
| [`PageAPI`](/page/python-net/aspose.page.xps.features.eventbasedmodifications/pageapi/) | The Page element modification API. |