[Rd] Class design as used in package graphics

[Ulrike Grömping]

Dear developeRs,

I just discovered the function plot.design in package graphics that acts as
a method for class design - the second time I come across a class design
outside my own packages. (The first time was in package conf.design, where
Bill Venables encouraged me to ignore it because he does not really use it.) 

Where can I find out more about the nature of the class design for which
function plot.design is written ? 

I am thinking of writing a function for my own packages that allows users to
choose between data frame plotting and the function plot.design from package
graphics; for this, it would be very helpful to understand what class design
consists of.

Thanks and regards,
Ulrike


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