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(guile.info)Primitive Properties

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Primitive Properties
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 - primitive: primitive-make-property not_found_proc
     Create a "property token" that can be used with
     `primitive-property-ref' and `primitive-property-set!'.  See
     `primitive-property-ref' for the significance of NOT_FOUND_PROC.

 - primitive: primitive-property-ref prop obj
     Return the property PROP of OBJ.  When no value has yet been
     associated with PROP and OBJ, call NOT-FOUND-PROC instead (see
     `primitive-make-property') and use its return value.  That value
     is also associated with OBJ via `primitive-property-set!'.  When
     NOT-FOUND-PROC is `#f', use `#f' as the default value of PROP.

 - primitive: primitive-property-set! prop obj val
     Associate CODE with PROP and OBJ.

 - primitive: primitive-property-del! prop obj
     Remove any value associated with PROP and OBJ.