Metadata on the dataset that are not interpreted are
title, description, license, publisher, keywords.
Metadata on the dataset that is interpreted are
update.scheme (always, never, and everything that
can be passed to seq.POSIXt as by parameter),
update.method (lastmod, fullreplace),
encoding (an element of iconvlist()), type (csv, csv2),
modified (automatically set, YYYY-mm-dd HH:MM:SS UTC format).Metadata on a dataset column that are currently interpreted are name,
type (logical, integer, numeric, complex, character, raw, factor, Date, POSIXct),
format (for Date and POSIXct, format string for strptime).