--- a/absyntax/absyntax.hh	Sun Nov 30 12:49:42 2014 +0000
+++ b/absyntax/absyntax.hh	Sat Dec 06 19:11:32 2014 +0000
@@ -247,6 +247,8 @@
     virtual void insert_element(symbol_c *elem, int pos = 0);
      /* remove element at position pos. */
     virtual void remove_element(int pos = 0);
+     /* remove all elements from list. Does not delete the elements in the list! */ 
+    virtual void clear(void);
 };