Maryland Code, Real Property § 14-618

(1) All persons known and unknown who were parties to the action and who have any claim to the property, whether present or future, vested or contingent, legal or equitable, several or undivided; and

(2) Except as provided in § 14-619 of this subtitle, all persons who were not parties to the action and who have any claim to the property that was not of record at the time the action was commenced.