user: Question: How many type classifications are given to the measure with the description, Calling Convention to revise State Constitution? 
Columns: ['meas. num', 'passed', 'YES votes', 'NO votes', '% YES', 'Const. Amd.?', 'type', 'description']
Types: ['real', 'text', 'real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'No', 35270.0, 59065.0, '37.39%', 'Yes', 'Init', 'Permitting female taxpayers to vote']
SQL:

assistant: SELECT COUNT("type") FROM "Table" WHERE "description" = 'Calling Convention to revise State Constitution';