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  \code{\link{levels}} which should be set for factors via the
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  \code{\link{levels}} which should be set for factors via the
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  \code{levels} replacement function.)
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  \code{levels} replacement function.)
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  The extractor function allows (and does not match) empty and missing
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  The extractor function allows (and does not match) empty and missing
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  values of \code{which}: the replacement function does not.
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  values of \code{which}: the replacement function does not.
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  Both are \link{primitive} functions.
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  Both are \link{primitive} functions.
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}
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}
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\value{
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\value{
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  For the extractor, the value of the attribute matched, or \code{NULL}
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  For the extractor, the value of the attribute matched, or \code{NULL}
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  if no exact match is found and no or more than one partial match is found.
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  if no exact match is found and no or more than one partial match is found.