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  relationship; lists of these objects are used to represent all the
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  relationship; lists of these objects are used to represent all the
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  extensions (superclasses) and subclasses for a given class.  The
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  extensions (superclasses) and subclasses for a given class.  The
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  object contains information about how the relation is defined and
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  object contains information about how the relation is defined and
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  methods to coerce, test, and replace correspondingly. }
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  methods to coerce, test, and replace correspondingly. }
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\section{Objects from the Class}{
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\section{Objects from the Class}{
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  Objects from this class are generated by \code{\link{setIs}}, both
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  Objects from this class are generated by \code{\link{setIs}},
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  from direct calls and from the \code{contains=} information in a call to \code{\link{setClass}}, and from class unions created by \code{\link{setClassUnion}}.
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  from direct calls .
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  In the last case, the information is stored in defining the \emph{subclasses} of the union class (allowing unions to contain sealed classes).
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}
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}
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\section{Slots}{
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\section{Slots}{
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  \describe{
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  \describe{
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    \item{\code{subClass,superClass}:}{The classes being extended:
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    \item{\code{subClass,superClass}:}{The classes being extended:
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    corresponding to the \code{from}, and \code{to} arguments to \code{\link{setIs}}. }
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    corresponding to the \code{from}, and \code{to} arguments to \code{\link{setIs}}. }