[Woodcarver] What is relief carving?

[David Andreychek]

Carvin' friends,

I am looking thru my new book, Inspirational Relief Carving by Bill Judt 
and found a pattern for a grape vine. It is carved so well that it 
appears that the grape vine was carved separately  and glued to the 
background.  Which leads me to the question.....

Is carving a figure and then attaching it to a background considered 
relief carving?   The back of the figure is not carved, but flat.

Also In Bill's book is a pattern for an angel blowing a trumpet.  It is 
a flat carving - I mean that it could be  less than 1" thick and 12" 
long with the back not carved, and meant to be hung on a wall.  Is this 
considered relief carving?

I was under the impression that relief carving was using one piece of 
wood with lots and lots and lots and lots (phew) of undercutting.

Comments?

Dave