Logical. Expression indicating elements or rows to keep:
missing values are taken as false.
select
Expression. Indicates columns to select from the data frame.
subcollections
Logical. Return subcollection metadata of higher level
collections.
supercollections
Logical. Return lowest level collection metadata.
locale
Character. Language of data returned. One of "en", "fi", or
"sv".
nmin
Integer. Filter collections by number of records. Only return
information on collections with greater than value specified. If NA then
return information on all collections.
cache
Logical or Integer. If TRUE or a number greater than zero,
then data-caching will be used. If not logical then cache will be
invalidated after the number of hours indicated by the argument.