Tart - pastry underneath Pie - pastry on the top.... 
Noooooooo. A pie has pastry all around, Top, bottom, sides with a nice deep filling like 
I was simplifying my answer to respond to the comprehension skills of the target audience.

and you are correct pastry all around.
Anyhow.... tonight Gnocchi with tomato and Tuna followed by Swiss Tart... oh here we go again.
