+ * Revision 1.13 1998-02-11 11:53:35 adam
+ * Changed code so that it compiles as C++.
+ *
+ * Revision 1.12 1997/11/18 09:51:09 adam
+ * Removed element num_children from data1_node. Minor changes in
+ * data1 to Explain.
+ *
+ * Revision 1.11 1997/09/17 12:10:36 adam