#' Retrieve the list of source uses in TAXREF
#'
#' TAXREF references many publications across its documentation. The different
#' sources are used for different reasons. This function returns the list of
#' usages for a source when no arguments are provided, otherwise returns the
#' specific type of use.
#'
#' @param usage_id {`NULL` or `numeric(1)` \[default = `NULL`\]}\cr{}
#' the id of a source use in TAXREF
#'
#' @examples
#' \dontrun{rt_source_uses(usage_id = 276)}
#'
#' @export
rt_source_uses = function(usage_id = NULL) {
stopifnot(
"'usage_id' must be a numeric or NULL" =
is.numeric(usage_id) | is.null(usage_id)
)
api_query = rt_GET("sourceUses/", usage_id)
parse_taxa(api_query)
}
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