1. app/site.adp:
   • provides default values for content,
   • the ::page::content method dispatcher proc and
   • a default rendering proc for each HTTP method, by default:

   ::page::get

   renders the ::page::content variable.

   ::page::post

   returns 405 Method Not Allowed.

   • and set ::page::form [ns_getform].
2. In the page ADP file: we either set the ::page::content variable or override the rendering proc.
3. tpl/site.adp calls ::page::content, the method dispatcher executing the respective renderer.