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6.5.1 Basic Presentation Types

These basic presentation types correspond to the Common Lisp types of the same name.

t  

Summary: The supertype of all other presentation types.

nil 

Summary: The subtype of all other presentation types. This has no printed representation, and is useful only in writing "context independent" translators, that is, translators whose to-type is nil .

null 

Summary: The presentation type that represents "nothing." The single object associated with this type is nil , and its printed representation is "None."

boolean

Summary: The presentation type that represents t or nil . The textual representation is "Yes" and "No," respectively.

symbol

Summary: The presentation type that represents a symbol.

keyword

Summary: The presentation type that represents a symbol in the keyword package. It is a subtype of symbol .

blank-area 

Summary: The type that represents all the places in a window where there is no presentation that is applicable in the current input context. CLIM provides a single "null presentation" as the object associated with this type.

*null-presentation* 

Summary: The null presentation, which occupies all parts of a window in which there are no applicable presentations. This will have a presentation type of blank-area .


CommonLisp Interface Manager 2.0 User's Guide - 8 Aug 2003

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