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  another, it should extract and call the method from the other
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  another, it should extract and call the method from the other
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  definition of the other class by calling \code{\link{getValidity}}: it
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  definition of the other class by calling \code{\link{getValidity}}: it
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  should \emph{not} call \code{validObject}.
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  should \emph{not} call \code{validObject}.
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}
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}
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\details{
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\details{
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  Validity testing takes place \dQuote{bottom up}: Optionally, if
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  Validity testing takes place \sQuote{bottom up}: Optionally, if
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  \code{complete=TRUE}, the validity of the object's slots, if any, is
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  \code{complete=TRUE}, the validity of the object's slots, if any, is
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  tested.  Then, in all cases, for each of the classes that this class
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  tested.  Then, in all cases, for each of the classes that this class
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  extends (the \dQuote{superclasses}), the explicit validity method of
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  extends (the \sQuote{superclasses}), the explicit validity method of
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  that class is called, if one exists.  Finally, the validity method of
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  that class is called, if one exists.  Finally, the validity method of
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  \code{object}'s class is called, if there is one.
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  \code{object}'s class is called, if there is one.
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  Testing generally stops at the first stage of finding an error, except
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  Testing generally stops at the first stage of finding an error, except
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  that all the slots will be examined even if a slot has failed its
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  that all the slots will be examined even if a slot has failed its