docs

library/lambda.pl

@@ -46,21 +46,23 @@ official policies, either expressed or implied, of Ulrich Neumerkel.
 This library provides lambda expressions to simplify higher order
 programming based on call/N.
 
-Lambda expressions are represented by ordinary Prolog terms.
-There are two kinds of lambda expressions:
+  Lambda expressions are represented by ordinary Prolog terms.
+  There are two kinds of lambda expressions:
 
-    Free+\X1^X2^ ..^XN^Goal
+  ~~~~  
+  Free+\X1^X2^ ..^XN^Goal
 
          \X1^X2^ ..^XN^Goal
+  ~~~~  
 
-The second is a shorthand for t+\X1^X2^..^XN^Goal.
+  The second is a shorthand for t+\X1^X2^..^XN^Goal
 
-Xi are the parameters.
+  + _Xi_ are the parameters.
 
-Goal is a goal or continuation. Syntax note: Operators within Goal
+  + _Goal_ is a goal or continuation. Syntax note: Operators within Goal
 require parentheses due to the low precedence of the ^ operator.
 
-Free contains variables that are valid outside the scope of the lambda
+  + _Free_ contains variables that are valid outside the scope of the lambda
 expression. They are thus free variables within.
 
 All other variables of Goal are considered local variables. They must
@@ -69,20 +71,20 @@ currently not checked. Violations may lead to unexpected bindings.
 
 In the following example the parentheses around X>3 are necessary.
 
-==
+~~~~~
 ?- use_module(library(lambda)).
 ?- use_module(library(apply)).
 
 ?- maplist(\X^(X>3),[4,5,9]).
 true.
-==
+~~~~~
 
-In the following X is a variable that is shared by both instances of
+In the following _X_ is a variable that is shared by both instances of
 the lambda expression. The second query illustrates the cooperation of
 continuations and lambdas. The lambda expression is in this case a
 continuation expecting a further argument.
 
-==
+~~~~~
 ?- Xs = [A,B], maplist(X+\Y^dif(X,Y), Xs).
 Xs = [A, B],
 dif(X, A),
@@ -92,11 +94,11 @@ dif(X, B).
 Xs = [A, B],
 dif(X, A),
 dif(X, B).
-==
+~~~~~
 
 The following queries are all equivalent. To see this, use
 the fact f(x,y).
-==
+~~~~~
 ?- call(f,A1,A2).
 ?- call(\X^f(X),A1,A2).
 ?- call(\X^Y^f(X,Y), A1,A2).
@@ -106,7 +108,7 @@ the fact f(x,y).
 ?- f(A1,A2).
 A1 = x,
 A2 = y.
-==
+~~~~~
 
 Further discussions
 http://www.complang.tuwien.ac.at/ulrich/Prolog-inedit/ISO-Hiord