;;   1. want filename to reflect page name (emacs limitation)
;;   2. that's it! no other reason. could make it configurable ...
;; page-dir-style is:
;;  'stored   => stored in executable
;;  'flat     => pages flat directory
;;  'dir      => directory tree pages/<pagename>/{view,control}.scm
;; parts:
;;  'both     => load control and view (anything other than view or control and the default)
;;  'view     => load view only
;;  'control  => load control only
(define (session:call-parts self page #!key (parts 'both))
  (sdat-set-curr-page! self page)
  (let* ((dir-style    (sdat-get-page-dir-style self));; (equal? (sdat-get-page-dir-style self) "onedir")) ;; flag #t for onedir, #f for old style
	 (dir          (string-append (sdat-get-sroot self) 
				      (if dir-style