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  object that returns \code{TRUE} or a description of the non-validity.
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  object that returns \code{TRUE} or a description of the non-validity.
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}
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}
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\usage{
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\usage{
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validObject(object, test)
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validObject(object, test)
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getValidity(ClassDef)
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setValidity(Class, method, where = 1 )
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setValidity(Class, method, where = 1 )
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}
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}
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\arguments{
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\arguments{
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  \item{object}{ Any object, but not much will happen unless the
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  \item{object}{ Any object, but not much will happen unless the
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    object's class has a formal definition.}
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    object's class has a formal definition.}
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    function returns a vector of strings describing the problems.  If
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    function returns a vector of strings describing the problems.  If
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    \code{test} is \code{FALSE} (the default) validity failure generates
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    \code{test} is \code{FALSE} (the default) validity failure generates
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    an error.}
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    an error.}
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  \item{Class}{The name or class definition of the class whose validity method is to be
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  \item{Class}{The name or class definition of the class whose validity method is to be
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    set.}
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    set.}
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  \item{ClassDef}{The class definition of the class whose validity method is to be
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    retrieved.}
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  \item{method}{A validity method;  that is, either \code{NULL} or a
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  \item{method}{A validity method;  that is, either \code{NULL} or a
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    function of one argument (the \code{object}).  Like
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    function of one argument (the \code{object}).  Like
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    \code{validObject}, the function should return \code{TRUE} if the
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    \code{validObject}, the function should return \code{TRUE} if the
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    object is valid, and one or more descriptive strings if any problems
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    object is valid, and one or more descriptive strings if any problems
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    are found.  Unlike \code{validObject}, it should never generate an
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    are found.  Unlike \code{validObject}, it should never generate an