I created some S4 objects that are essentially data frame objects.  The S4
object definitions were necessary to verify data integrity and force a
standardized data format.  I am, however, finding myself redefining all the
typical generic functions so that I can still manipulate my S4 objects as if
they were data frames ... I have used setMethod to set methods for "subset",
"head", and "tail".  I would like to use setMethod or setGeneric to enable
me to use object$slotname to access object@slotname for my S4 objects.  Any
advice is appreciated.  Thanks.
--Markus

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