#' List available metadata formats that the PubMed Central repository can disseminate.
#'
#' @import OAIHarvester
#' @param id DataCite identifier, e.g., "56225"
#' @param transform transform metadata to list (TRUE/FALSE)
#' @param url the base url for DataCite (leave to default)
#' @export
#' @examples \dontrun{
#' pmc_listmetadataformats() # list all possible metadata formats for PMC
#' pmc_listmetadataformats("56225") # possible metadata formats for specific identifier
#' }
pmc_listmetadataformats <- function(id = NULL, transform = TRUE,
url = "http://www.pubmedcentral.gov/oai/oai.cgi")
{
if(!is.null(id) == T) {oaiid <- paste("oai:pubmedcentral.nih.gov:", id, sep="")} else
{oaiid <- NULL}
oaih_list_metadata_formats(
url,
oaiid,
transform = transform)
}
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