The illustration basics01.gif shows the anatomy of a page group. On the left, the illustration shows a hierarchy of pages, with the root page at the top and several pages of different types underneath that. The middle section of the illustration shows a portal page in a browser window with callouts showing that the content of the page is made up of several regions, and that those regions can contain portlets or items. The right hand side of the illustration lists the different objects that can be reused in different page groups: navigation pages, styles, templates, custom page types, custom item types, custom attributes, perspectives, and categories.