Pages within the UI are defined with the following definitions:
Tab definitions - Divide the application into functional areas by defining the top level navigation. They also specify page structures using cell and template definitions and define the panels and panel stack definitions that comprise the page
Cell definitions - Define the basic layout of the page, including the position of panel stacks
Panel stack definitions - Contains a collection of panels that will be displayed within the page
Panel definitions - Defines a rectangular region of the page with related content referenced by an include JSP content template
When you create a new page, you create a tab definition that contains the other definition objects, thus defining page structure and layout. For detailed information on the definition object, refer to the Framework Objects section.