++++ 1 . Preliminary rulings - Jurisdiction of the Court - Limits - Spurious dispute or request for an interpretation of Community provisions which are not applicable to the main proceedings - Interpretation requested by reason of the applicability of a provision of Community law owing to a reference thereto incorporated into national law - Jurisdiction to give such an interpretation ( EEC Treaty, Art . 177 ) 2 . Common Customs Tariff - Headings - Criteria for distinguishing between Heading 9701 and Heading 9703