#' World Development Indicators series and country information
#'
#' A list of two character matrices.
#'
#' The first character matrix includes a full list of WDI series. This list is updated semi-regularly. Users can refresh the list manually using the `WDIcache()` function and search in the updated list using the `cache` argument.
#'
#' \itemize{
#' \item id WDI indicator code
#' \item name Short name of the series
#' \item sourceNote Detailed description provided by the source
#' \item source Source database
#' \item sourceOrganization Source organization
#' }
#'
#' The second character matrix includes extra country information (updated 2012-06-18):
#'
#' \itemize{
#' \item iso3c ISO 3-letter country code
#' \item iso2c ISO 2-letter country code
#' \item country Country name (long English form)
#' \item region Region
#' \item capital Capital
#' \item longitude Longitude
#' \item latitude Latitude
#' \item income Income level as defined by the World Bank
#' \item lending Lending category, as defined by the World Bank
#' }
#' @docType data
#' @keywords datasets
#' @name WDI_data
#' @usage WDI_data
#' @encoding UTF-8
#' @format List of 2 data frames
NULL
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