+ * Revision 1.19 1998-03-05 08:15:32 adam
+ * Implemented data1_add_insert_taggeddata utility which is more flexible
+ * than data1_insert_taggeddata.
+ *
+ * Revision 1.18 1998/02/27 14:08:04 adam
+ * Added const to some char pointer arguments.
+ * Reworked data1_read_node so that it doesn't create a tree with
+ * pointers to original "SGML"-buffer.
+ *
+ * Revision 1.17 1998/02/11 11:53:34 adam
+ * Changed code so that it compiles as C++.
+ *
+ * Revision 1.16 1997/12/18 10:51:30 adam
+ * Implemented sub-trees feature for schemas - including forward
+ * references.
+ *
+ * Revision 1.15 1997/12/09 16:18:16 adam
+ * Work on EXPLAIN schema. First implementation of sub-schema facility
+ * in the *.abs files.
+ *
+ * Revision 1.14 1997/10/31 12:20:09 adam
+ * Improved memory debugging for xmalloc/nmem.c. References to NMEM
+ * instead of ODR in n ESPEC-1 handling in source d1_espec.c.
+ * Bug fix: missing fclose in data1_read_espec1.
+ *
+ * Revision 1.13 1997/10/27 13:54:18 adam
+ * Changed structure field in data1 node to be simple string which
+ * is "unknown" to the retrieval system itself.
+ *
+ * Revision 1.12 1997/09/17 12:10:34 adam