CREATE TABLE table_27944 ("meas. num" FLOAT, "passed" TEXT, "YES votes" FLOAT, "NO votes" FLOAT, "% YES" TEXT, "Const. Amd.?" TEXT, "type" TEXT, "description" TEXT)

How many type classifications are given to the measure with the description, calling convention to revise state constitution?
SELECT COUNT("type") FROM table_27944 WHERE "description" = 'Calling Convention to revise State Constitution'
SELECT COUNT("type") FROM "table_27944" WHERE "description" = 'Calling Convention to revise State Constitution'