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 \name{secondaryKey.IdMapBase}
\alias{secondaryKey.IdMapBase}
\alias{IdMapBase.secondaryKey}
\alias{secondaryKey.IdMapBase}
\alias{secondaryKey,IdMapBase-method}


 \title{Retrieves a secondary key for a given IdMapBase object}
 \description{Retrieves a secondary key for a given IdMapBase object.}

 \usage{\method{secondaryKey}{IdMapBase}(this, ...)}

 \arguments{\item{...}{Not used}}
 \value{A \code{\link[base]{character}} string representing secondary key for given IdMapBase object}

 \examples{
 obj<-IdMapBase(examples$identDfList[[1]]);
 obj$secondaryKey();
 }
 \seealso{For more information see \code{\link{IdMapBase}}.}
 \author{Alex Lisovich, Roger Day}
\keyword{internal}
\keyword{methods}