X82 Subfield $i - Relationship information: [482, 582, 782]
Subfield $i contains the designation of a relationship of the entity in a 482, 582, or 782 field to the 1XX entity in the record or a textual reference instruction phrase. For fields 482 and 582 the phrase may be system-generated from the field tag or from the codes defined for subfield $w (Control subfield). Subfield $i is appropriate only in fields 482, 582, and 782.
Guidelines for using subfield $i: