1 . CONVENTION ON JURISDICTION AND THE ENFORCEMENT OF JUDGMENTS - JURISDICTION - JURISDICTION OF THE COURT FOR THE PLACE OF PERFORMANCE - JURISDICTION OF THE COURT DESIGNATED BY THE PARTIES - NATURE AND FOUNDATION OF BOTH ( CONVENTION OF 27 SEPTEMBER 1968 , ARTS . 5 ( 1 ) AND 17 ) 2 . CONVENTION ON JURISDICTION AND THE ENFORCEMENT OF JUDGMENTS - JURISDICTION - JURISDICTION OF THE COURT FOR THE PLACE OF PERFORMANCE - DESIGNATION OF PLACE OF PERFORMANCE BY A CLAUSE VALID ACCORDING TO THE LAW APPLICABLE - OBSERVANCE OF FORMAL CONDITIONS PROVIDED FOR UNDER ARTICLE 17 NOT REQUIRED ( CONVENTION OF 27 SEPTEMBER 1968 , ARTS . 5 ( 1 ) AND 17 )