GatherProviderDataFrame: Gather EOL Provider Information
Description
This function will read in the downloaded xml files and amass a data frame with provider information. Information will include taxon name, eol number, and information from each provider in the following order: provider taxon, provider taxon ID, provider scientific name, provider taxonomy rank.
A vector of filenames or a list of XMLs for downloaded EOL pages
extended.output
If set to TRUE, then a large dataframe will be returned with information from each provider in the following order: provider taxon, provider taxon ID, provider scientific name, provider taxonomy rank.
Value
Returns a data frame with presence/absence of provider information or if extended.output=TRUE ID values for each provider.