Although somewhat redundant with the owner information contained in observationContributor with roleCode of owner, this allows the program to provide ownership information automatically. The ownership field supercedes this field in priority.
Code that uniquely references this record, allowing reference to this record for this version of this database. Better than a primary key, which is automatically generated by a database and not globally unique. VegBank Accession codes are only generated by VegBank, and therefore data integrity can be guaranteed, unlike with a primary key (number).