(2) In such suit any number of owners of different lots, subdivisions of lots, pieces or parcels of the cemetery may be included in the one suit.
(3) It is a sufficient designation of the property so abandoned and unimproved to give the lot number or portion thereof, or a description of the piece or parcel having no lot number, together with the name of the owner thereof, as appears on the record of the cemetery authority.
(4) In addition to the names of the persons that appear on the records of the cemetery authority as the record owners of such unused and unimproved portions of the cemetery, the plaintiff shall include as a defendant in a complaint the following: "Also all other persons unknown claiming any right, title, estate, lien or interest in the unused and unimproved portions of the cemetery described in the complaint." [Amended by 2003 c.576 §358; 2007 c.661 §10]