The binding legal principles established are: (1) A real, genuine and bona fide dispute of fact requiring referral to trial can only exist where the respondent's affidavits seriously and unambiguously address the facts said to be disputed - bare denials or ambiguous denials are insufficient, particularly where the disputing party must necessarily possess knowledge of the facts. (2) In an actio rei vindicatio, the plaintiff must prove ownership of clearly identifiable property and that the defendant is in possession of it at commencement of the action; once ownership is proved, its continuation is presumed and the onus shifts to the defendant to prove a right of retention. (3) Prescription must be specifically pleaded as the court requires a factual background to determine the issue; it cannot be raised for the first time in heads of argument which are not pleadings. (4) Third parties such as estate agents and conveyancers need not be joined to vindicatio proceedings where they are not relevant to proving the essential elements of ownership and possession.