who is the president of parliamentary assembly of the organization for security and co-operation in europe ?
select distinct var_uri where brack_open dbr_Parliamentary_Assembly_of_the_Organization_for_Security_and_Co-operation_in_Europe dbo_leader var_uri sep_dot dbr_Parliamentary_Assembly_of_the_Organization_for_Security_and_Co-operation_in_Europe dbo_leaderTitle 'President'@en brack_close