#'
#' \strong{Metadata Parameters}
#' @param key Character string or a vector of strings containing a key or
#' keys for metadata key/value pair(s). If vector, must be of equal length
#' of value vector.
#' @param value Character string or numeric, or a vector thereof, containing
#' a value or values for metadata key/value pair(s). If vector, must be of
#' equal length of key vector.
#' @param select Character string parameter used by the summary method.
#' Allows clients to select a specific type of metadata. Valid values are:
#' c('id', 'descriptive', 'functional', 'quant', 'admin', 'technical)
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