The Philippines adopts the "General" trade system of recording foreign trade statistics. The customs frontier (not the national boundary) is used as the statistical frontier. Under this system, all goods entering any of the seaports or airports of entry of the Philippines properly cleared through customs or remaining or under customs control are considered imports, whether the goods are for direct consumption, for merchandising, for warehousing or further processing. On the other hand, all goods leaving the country, which are properly cleared through the Customs, are considered exports. A distinction however, is made between export for goods grown, mined or manufactured in the Philippines (domestic exports) and exports of imported goods that do not undergo physical and or chemical transformation in the Philippines (re-exports).