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\section{Slots}{\describe{
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\section{Slots}{\describe{
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\item{\code{argument}:}{Object of class \code{"name"}. The name of the
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\item{\code{argument}:}{Object of class \code{"name"}. The name of the
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argument being used for dispatch at this level. }
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argument being used for dispatch at this level. }
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\item{\code{methods}:}{A named list of the methods (and method lists)
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\item{\code{methods}:}{A named list of the methods (and method lists)
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defined \emph{explicitly} for this argument.
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defined \emph{explicitly} for this argument.
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The names are the names of classes, and the corresponding
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The names are the names of classes, and the corresponding
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element defines the method or methods to be used if the corresponding
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element defines the method or methods to be used if the corresponding
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argument has that class. See the details below.}
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argument has that class. See the details below.}
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\item{\code{allMethods}:}{A named list, contains
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\item{\code{allMethods}:}{A named list, contains
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all the directly defined methods from the \code{methods} slot, plus
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all the directly defined methods from the \code{methods} slot, plus
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generally be either a function or another methods list object.
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generally be either a function or another methods list object.
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In the first case, the function defines the method to use for any call
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In the first case, the function defines the method to use for any call
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in which \code{x} is of class \code{"track"}. In the second case, the
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in which \code{x} is of class \code{"track"}. In the second case, the
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new methods list object defines the available methods depending on
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new methods list object defines the available methods depending on
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the remaining formal arguments, in this example, \code{y}.
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the remaining formal arguments, in this example, \code{y}.
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Each method corresponds conceptually to a \emph{signature};
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Each method corresponds conceptually to a \emph{signature};
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that is a named list of classes, with names corresponding to some or
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that is a named list of classes, with names corresponding to some or
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all of the formal arguments. In the previous example, if selecting
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all of the formal arguments. In the previous example, if selecting
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class \code{"track"} for \code{x}, finding that the selection was
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class \code{"track"} for \code{x}, finding that the selection was
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