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  \code{NextMethod} should not be called except in methods called by
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  \code{NextMethod} should not be called except in methods called by
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  \code{UseMethod}. In particular it will not work inside anonymous
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  \code{UseMethod}. In particular it will not work inside anonymous
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  calling functions (eg \code{get("print.ts")(AirPassengers)}).
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  calling functions (eg \code{get("print.ts")(AirPassengers)}).
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  Name spaces can register methods for generic functions.  To support
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  this, \code{UseMethod} and \code{NextMethod} search for methods in
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  two places: first in the environment in which the generic function
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  is called, and then in the registration data base for the
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  environment in which the generic is defined (typically a name space).
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  So methods for a generic function need to either be available in the
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  environment of the call to the generic, or they must be registered.
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  It does not matter whether they are visible in the environment in
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  which the generic is defined.
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}
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}
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\note{
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\note{
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  This scheme is called \emph{S3} (S version 3).  For new projects,
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  This scheme is called \emph{S3} (S version 3).  For new projects,
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  it is recommended to use the more flexible and robust \emph{S4} scheme
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  it is recommended to use the more flexible and robust \emph{S4} scheme
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  provided in the \pkg{methods} package.
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  provided in the \pkg{methods} package.