#' hathi_bib
#'
#' There are two sections: records which holds basic metadata about the set of records which match
#' the query, and items which lists the complete set of individual HathiTrust items (volumes)
#' associated with those records.
#'
#' @section Records:
#'
#' The records section. The records structure is a hash keyed on the nine-digit record number of
#' each matched record. It may easily contain multiple records, since duplicates, while not
#' common, are certainly possible.
#'
#' For each record:
#'
#' \itemize{
#' \item recordURL: The URL to the catalog display record.
#' \item titles: The list of titles associated with this record, for sanity checking. This list
#' includes the standard (MARC field 245) title with and without leading articles, and any
#' vernacular (foreign language) titles provided in the record (MARC field 880).
#' \item isbns, issns, lccns, oclcs, lccns: Each is a (possibly empty) list of identifiers of the
#' appropriate type.
#' \item marc-xml: The full MARC-XML of the record if the URL was of the form /api/volumes/full/...
#' MARC-XML is not included in brief return values.
#' }
#'
#' @section Items:
#'
#' The items structure is an array of hashes describing all the available items associated with
#' matched records. There may be multiple items because the record(s) in question describe a
#' serial or multi-volume set, or because identical volumes were digitized at more than one
#' contributing institution.
#'
#' For each item:
#'
#' \itemize{
#' \item orig: The originating institution -- where this particular volume was digitized.
#' \item fromRecord: The nine-digit record number to which this particular item is attached. It
#' will always be one of the records listed in the records section.
#' \item htid: The HathiTrust volume id.
#' \item itemURL: The URL to this item in the pageturner interface. This is trivially derived from
#' the htid at the moment, but is included here in the event that the handle URLs get more complex
#' in the future.
#' \item rightsCode: The rights code as used in the downloadable files, describing the copyright
#' status of the item and what users in various locales are able to do with it.
#' \item lastUpdate: The date (YYYYMMDD) this item was ingested or last changed (because, e.g.,
#' the rights determination changed).
#' \item enumcron: The enumeration/chronology of the item, describing its place in a series.
#' These are commonly of the form, "vol. 3, n. 2 1993" or something similar. Used to sort the
#' items when present.
#' \item usRightsString: A textual description of the rights for a US-based user. This is, again,
#' trivially derived from the rightsCode, but useful enough to the majority of likely users that
#' it is included here. Will be either "Limited (search only)" or "Full View." As noted, a
#' reasonably-sophisticated attempt is made to sort items by their enumcron (when present),
#' often resulting in the items listed correctly by volume/number. Variation in the way these
#' data have been entered at different institutions and at different times makes it impractical
#' to guarantee the order will be correct, but it is more often than not correct.
#' }
#'
#' @references \url{http://www.hathitrust.org/bib_api}
#' @name hathi
NULL
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