#' Function to export geometries as a Geography Markup Language (GML) file.
#'
#' \code{write_gml} uses \code{rgdal::writeOGR} for the spatial data writer
#' and will write projection information.
#'
#' @author Stuart K. Grange
#'
#' @param sp Spatial object to be written as a GML/XML file.
#'
#' @param file Filename of GML/XML file.
#'
#' @param layer A string which represents the layer of the GML file where the
#' geometries will be stored. Default uses a generic \code{spatial} string.
#'
#' @examples
#' \dontrun{
#'
#' # Export polygons
#' write_gml(sp_zones, "~/Desktop/zone_polygons.gml", layer = "zones")
#'
#' }
#'
#' @export
write_gml <- function(sp, file, layer = "spatial") {
# Expand path
file <- path.expand(file)
# Add data slot if not present
sp <- sp_promote(sp)
# Write file
rgdal::writeOGR(sp, file, layer = layer, driver = "GML",
overwrite_layer = TRUE)
# No return
}
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