Initial data commit

Task/Abstract-type/Oz/abstract-type.oz

@@ -0,0 +1,23 @@
+declare
+  class BaseQueue
+     attr
+        contents:nil
+
+     meth init
+        raise notImplemented(self init) end
+     end
+
+     meth enqueue(Item)
+        raise notImplemented(self enqueue) end
+     end
+
+     meth dequeue(?Item)
+        raise notImplemented(self dequeue) end
+     end
+
+     meth printContents
+        {ForAll @contents Show}
+     end
+  end
+
+  Queue = {New BaseQueue init} %% throws