protected function defineAttributes()
{
return array('status' => array(AttributeType::Enum, 'values' => array(Workflow_SubmissionModel::APPROVED, Workflow_SubmissionModel::PENDING, Workflow_SubmissionModel::REJECTED, Workflow_SubmissionModel::REVOKED)), 'notes' => array(AttributeType::Mixed), 'dateApproved' => array(AttributeType::DateTime), 'dateRejected' => array(AttributeType::DateTime), 'dateRevoked' => array(AttributeType::DateTime));
}