How to dynamically select a node from xml response

Hi:

Can I just do it directly at the property transfer step or do I need to write a groovy code for it?

Here is the xpath:

declare namespace ns1='http://services.tvguide.com/v6/notifications';
//ns1:GetNotificationTargetsResponse[1]/ns1:GetNotificationTargetsResult[1]/ns1:NotificationTargets[1]/ns1:NotificationTarget[1]/ns1:NotificationTargetId[1]

I tried different combinations but didn't seem to work.  Should I have the following?

declare namespace ns1='http://services.tvguide.com/v6/notifications';
//ns1:GetNotificationTargetsResponse[1]/ns1:GetNotificationTargetsResult[1]/ns1:NotificationTargets[1]/ns1:NotificationTarget[DeliveryFormat='HTMLEmail']/ns1:NotificationTargetId[1]

Regards,
Li