How to set utf8 charset, utf8_collate_ci as collation?

Symfony 1.4 propel schema.yml: How to set utf8 charset, utf8_collate_ci as collation?

all:
  doctrine:
    class: sfDoctrineDatabase
    param:
      dsn: 'mysql:host=localhost;dbname=mydb'
      username: myusername
      password: mypassword
      attributes:
        default_table_charset: utf8
        default_table_collate: utf8_general_ci


Learn More :