(documentationtotalGDPInPeriodEnglishLanguage "(totalGDPInPeriod ?AREA ?AMOUNT ?PERIOD) means that the value of all final goods and services produced within the GeopoliticalArea ?AREA is ?AMOUNT in the period indicated by ?PERIOD, measured in U.S. dollars calculated on a purchasing power parity basis. (See PPPBasedEconomicValuation.) This is the Gross Domestic Product for ?AREA for a specified period.")