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      The prototype most commonly just consists of the prototypes of all
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      The prototype most commonly just consists of the prototypes of all
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      its slots.  But that need not be the case:  the definition of the
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      its slots.  But that need not be the case:  the definition of the
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      class can specify any valid object for any of the slots.
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      class can specify any valid object for any of the slots.
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      There are a number of ``basic'' classes, corresponding to the
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      There are a number of \dQuote{basic} classes, corresponding to the
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      ordinary kinds of data occurring in R.  For example,
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      ordinary kinds of data occurring in R.  For example,
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      \code{"numeric"} is a class corresponding to numeric vectors.
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      \code{"numeric"} is a class corresponding to numeric vectors.
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      These classes are predefined and can then be used as slots or as
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      These classes are predefined and can then be used as slots or as
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      superclasses for any other class definitions.  The prototypes for
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      superclasses for any other class definitions.  The prototypes for
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      the vector classes are vectors of length 0 of the corresponding
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      the vector classes are vectors of length 0 of the corresponding