OptionalcrossrefFor fields inherited through crossref, records the parent entry key and source field name.
Parsed field values, with known name, options and list fields represented as arrays.
Source text for this entry.
Citation key identifying this entry.
Parsing mode used for each field; see ParseMode.
Entry type from the source, such as article or inproceedings.
Original text for fields whose parsed representation is structured.
A normalized BibTeX entry returned by the parser.