Biztalk Map Input xml Node Exists ?

Today I figured out the easiest way to Map a xml node to a destination node only if source node exists.

if the source node doesnt exist, the destination node doesnt get created at all in the output xml.

No need of any functoids.

just Drag a map link from the source node to the destination node root. thats it .

none of the child elements get mapped with dummy values if the root node itself is not present in the source xml.