func (client *SIRIClient) DeleteSubscription(request *siri.SIRIDeleteSubscriptionRequest) (*sxml.XMLDeleteSubscriptionResponse, error) {
    node, err := client.prepareAndSendRequest(siriClientArguments{
        request:           request,
        requestType:       SUBSCRIPTION,
        expectedResponses: []string{"DeleteSubscriptionResponse", "TerminateSubscriptionResponse"},