This table cross-references the table t_author and t_refdb.
This is the unique ID of a t_xauthor entry, stored as an INT value.
This is the ID of the author in the t_author table, stored as an INT value.
This is the ID of the reference in the t_refdb table, stored as an INT value.
This ENUM field has the three possible values "primary", "secondary", and "tertiary" which denote that the person is a regular author, an editor, or a series editor in the given reference, respectively.
This INT field stores the original position of the author in the paper. The sequence of authors is taken from the sequence they appear in the RIS file.