#' @@family: associate the function with a family to automatically add
#' cross-references.
#'
#' All functions with the same family will have cross-references automatically
#' added to all other functions in the family.
#'
#' @tagUsage @@family the name of the family
setClass("FamilyTag", contains = "Tag")
setMethod("value<-", "FamilyTag", function(tag, value) {
tag@text <- unique(str_trim(value))
tag
})
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