1 files changed, 16 insertions, 0 deletions
diff --git a/book/examples/chapter6/Smart.gf b/book/examples/chapter6/Smart.gf
new file mode 100644
index 000000000..6fc3e0bc5
--- /dev/null
+++ b/book/examples/chapter6/Smart.gf
@@ -0,0 +1,16 @@
+abstract Smart = {
+
+  cat
+    Command ;
+    Kind ; 
+    Device Kind ; 
+    Action Kind ; 
+
+  fun 
+    Act : (k : Kind) -> Action k -> Device k -> Command ;
+    The : (k : Kind) -> Device k ;  -- the light
+    Light, Fan : Kind ;
+    Dim : Action Light ;
+    SwitchOn, SwitchOff : (k : Kind) -> Action k ;
+
+}