In this Part:
"proceeding" means a proceeding in a tribunal in connection with the performance of an adjudicative function by the tribunal.
"subpoena" means a process that requires a person to do one or both of the following:
(a) to give oral evidence before a tribunal;
(b) to produce a document or thing to a tribunal;
but does not include a process that requires a person to produce a document in connection with discovery and inspection of documents.
"tribunal of issue" , in relation to a process, means the tribunal by which the process was issued.