====== List define ======
{{tag>lists}}
===== Description =====
Defining a list

**Source**:  The Art of Prolog
===== Download =====
Program source code: {{list_define.pl}}
===== Listing =====
<code prolog>
/*
	list(Xs) :- Xs is a list.
*/

	list([]).
	list([X|Xs]) :- list(Xs).

%	Program 3.11: Defining a list
</code>
===== Comments =====