changes prior to release

Anniepoo · May 18, 2013 · 0dc64bd · 0dc64bd
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diff --git a/README.md b/README.md
@@ -1,4 +1,12 @@
 swipldcgtut
 ===========
 
-A tutorial for DCG's in swi-Prolog
+A tutorial for DCG's in swi-Prolog
+
+this tutorial is available on the web at 
+
+http://www.pathwayslms.com/swipltuts/dcg/index.html
+
+These files contain some examples to accompany the tutorial.
+
+
diff --git a/carlo/pure_input.pl b/carlo/pure_input.pl
diff --git a/carlo/test_pio.pl b/carlo/test_pio.pl
diff --git a/dcg1_1.pl b/dcg1_1.pl
@@ -1,7 +1,7 @@
+% DCG that recognizes a list of a's
 as --> [].
 as --> [a], as.
 
 %
 % Run by querying
 % ?- phrase(as, Ls).
-
diff --git a/dcg1_2.pl b/dcg1_2.pl
@@ -1,3 +1,5 @@
+% double quoted strings are just lists of UTF-8 codes,
+% so they're terminals too
 cliche -->
     thing,
     " is a ",
@@ -9,8 +11,10 @@
 type_of_thing --> "Unix OS".
 opposite_type_of_thing --> "Windows'".
 
+% query try_literals. to see cliches
 try_literals :- phrase(cliche, X),format('~s~n', [X]).
 
+% you can unify arguments, just like normal prolog predicates
 fizz_buzz(Msg) --> anything, fizz(Msg), anything, buzz, anything.
 anything --> [].
 anything --> [_], anything.