Canon 463. §1 The following are to be summoned to the diocesan synod as members and they are obliged to participate in it:

1° the coadjutor Bishop and the auxiliary Bishops;

2° the Vicars general and episcopal Vicars, and the judicial Vicar

3° the canons of the cathedral church;

4° the members of the council of priests;

5° lay members of Christ’s faithful, not excluding members of institutes of consecrated life, to be elected by the pastoral council in the manner and the number to be determined by the diocesan Bishop or, where this council does not exist, on a basis determined by the diocesan Bishop;

6° the rector of the major seminary of the diocese;

7° the vicars forane;

8° at least one priest from each vicariate forane to be elected by all those who have the care of souls there; another priest is also to be elected, to take the place of the first if he is prevented from attending;

9° some Superiors of religious institutes and of societies of apostolic life which have a house in the diocese: these are to be elected in the number and the manner determined by the diocesan Bishop.

§2 The diocesan Bishop may also invite others to be members of the diocesan synod, whether clerics or members of institutes of consecrated life or lay members of the faithful.

§3 If the diocesan Bishop considers it opportune, he may invite to the diocesan Synod as observers some ministers or members of Churches or ecclesial communities which are not in full communion with the catholic Church.