'Returns information about the specified activity type. This
includes configuration settings provided at registration time
as well as other general information about the type.
:type domain: string
:param domain: The name of the domain in which the activity
type is registered.
:type activity_name: string
:param activity_name: The name of this activity.
:type activity_version: string
:param activity_version: The version of this activity.
:raises: UnknownResourceFault, SWFOperationNotPermittedError'

def describe_activity_type(self, domain, activity_name, activity_version):

    return self.json_request('DescribeActivityType', {'domain': domain, 'activityType': {'name': activity_name, 'version': activity_version}})
