(a) Definition of "body or officer". The expression "body or officer" includes every court, tribunal, board, corporation, officer, or other person, or aggregation of persons, whose action may be affected by a proceeding under this article(b) Persons whose terms of office have expired; successors. Whenever necessary to accomplish substantial justice, a proceeding under this article may be maintained against an officer exercising judicial or quasi-judicial functions, or member of a body whose term of office has expired. Any party may join the successor of such officer or member of a body or other person having custody of the record of proceedings under review.(c) Prohibition in favor of another. Where the proceeding is brought to restrain a body or officer from proceeding without or in excess of jurisdiction in favor of another, the latter shall be joined as a party.(d) Other interested persons. The court may direct that notice of the proceeding be given to any person. It may allow other interested persons to intervene.