Rendering and views

Rendering(o => …) adds code defaults, selectors and template kinds to the site's rendering options (chapter 8). Views() adds the views, controllers and Razor Pages compiled into the module, so a module built as a Razor class library can render with its own views, such as Views/Shared/EventPage.cshtml. The site's _ViewStart gives them the site's layout. The host still adds the MVC or Razor Pages rendering.

A module's pages get their URLs from the site's URL manager (chapter 6). On a site whose URLs follow the page tree, a page needs a place in the tree, hence ParentPageId. A page type never declares Parent or Children of its own: every IPage has them.