1 . CONVENTION ON JURISDICTION AND THE ENFORCEMENT OF JUDGMENTS - JURISDICTION BY CONSENT - AGREEMENT CONFERRING JURISDICTION - CONTRACT OF INSURANCE - JURISDICTION CLAUSE FOR THE BENEFIT OF THIRD PARTIES WHO HAVE NOT SIGNED THE CLAUSE - RIGHT OF THIRD PARTIES TO AVAIL THEMSELVES OF THE SAID CLAUSE - CONDITIONS ( CONVENTION OF 27 SEPTEMBER 1968 , ART . 17 ) 2 . CONVENTION ON JURISDICTION AND THE ENFORCEMENT OF JUDGMENTS - JURISDICTION BY CONSENT - APPEARANCE OF THE DEFENDANT BEFORE THE COURT SEISED OF THE MATTER - APPEARANCE NOT ONLY TO CONTEST JURISDICTION BUT ALSO TO PLEAD AS TO THE SUBSTANCE - APPEARANCE NOT CONFERRING JURISDICTION ( CONVENTION OF 27 SEPTEMBER 1968 , ART . 18 )