selective accept

• To: ttrinko@dipl.rdd.lmsc.lockheed.com, clim@BBN.COM
• Subject: selective accept
• From: Richard Billington <buff@cc.gatech.edu>
• Date: Wed, 29 Jul 1992 17:17-0400
• Character-Type-Mappings: (1 0 (NIL 0) (NIL :BOLD NIL) "CPTFONTCB")
• Fonts: CPTFONT, CPTFONTCB
• In-Reply-To: <9207292011.AA27554@jade.rdd.lmsc.lockheed.com>

Just a couple of quick ideas, 'cause I'm not sure I exactly understand your
problem:  what about defining a tester for the translator? Alternatively, (and
this is where I'm not sure I understand your problem), create a new
presentation type which inherits from your present one and create translators
for that new type:

(define-presentation-type 1button 0(button-type) :options (aspect)
  :description
  "Buttons display some representation of an object
   and associate behavior with it.
   button-type ::= [ link | aspect | user-type | set | control ]
   aspect ::= [ text | graphic | video ]")

(define-presentation-type 1hyperobject-link-button 0() :options (link-aspect)
			  :inherit-from `((button link) :aspect ,link-aspect))


Also don't forget that you've got to define a presentation-subtypep method for
parameterized presentation-types (sec. 17.6.2, p. 170 Symbolics CLIM).

• selective accept
• From: Tom Trinko <ttrinko@dipl.rdd.lmsc.lockheed.com>

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