+ * Revision 1.38 2001-03-27 23:06:21 adam
+ * Quotes and slashes may occur within attributes.
+ *
+ * Revision 1.37 2001/02/28 09:00:06 adam
+ * Fixed problem with stack overflow for very nested records.
+ *
+ * Revision 1.36 2001/02/21 13:46:53 adam
+ * C++ fixes.
+ *
+ * Revision 1.35 2000/12/05 14:44:25 adam
+ * Readers skips <! ...> sections.
+ *
+ * Revision 1.34 2000/12/05 10:06:23 adam
+ * Added support for null-data rules like <tag/>.
+ *
+ * Revision 1.33 2000/11/29 14:22:47 adam
+ * Implemented XML/SGML attributes for data1 so that d1_read reads them
+ * and d1_write generates proper attributes for XML/SGML records. Added
+ * register locking for threaded version.
+ *
+ * Revision 1.32 2000/01/06 11:25:59 adam
+ * Added case to prevent warning.
+ *
+ * Revision 1.31 1999/12/21 14:16:20 ian
+ * Changed retrieval module to allow data1 trees with no associated absyn.
+ * Also added a simple interface for extracting values from data1 trees using
+ * a string based tagpath.
+ *
+ * Revision 1.30 1999/11/30 13:47:12 adam
+ * Improved installation. Moved header files to include/yaz.
+ *
+ * Revision 1.29 1999/10/21 12:06:29 adam
+ * Retrieval module no longer uses ctype.h - functions.
+ *
+ * Revision 1.28 1999/10/21 09:50:33 adam
+ * SGML reader uses own isspace - it doesn't do 8-bit on WIN32!
+ *
+ * Revision 1.27 1999/08/27 09:40:32 adam
+ * Renamed logf function to yaz_log. Removed VC++ project files.
+ *
+ * Revision 1.26 1999/07/13 13:23:48 adam
+ * Non-recursive version of data1_read_node. data1_read_nodex reads
+ * stream of bytes (instead of buffer in memory).
+ *
+ * Revision 1.25 1999/04/20 09:56:48 adam
+ * Added 'name' paramter to encoder/decoder routines (typedef Odr_fun).
+ * Modified all encoders/decoders to reflect this change.
+ *
+ * Revision 1.24 1998/10/28 15:10:09 adam
+ * Added --with-yc option to configure. For the data1_node in data1.h:
+ * decreased size of localdata and removed member "line" which wasn't useful.
+ *
+ * Revision 1.23 1998/03/12 11:28:45 adam
+ * Fix: didn't set root member of tagged node in function.
+ * data1_add_insert_taggeddata.
+ *
+ * Revision 1.22 1998/03/05 08:15:32 adam
+ * Implemented data1_add_insert_taggeddata utility which is more flexible
+ * than data1_insert_taggeddata.
+ *
+ * Revision 1.21 1998/02/27 14:08:05 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 1.20 1998/02/11 11:53:35 adam
+ * Changed code so that it compiles as C++.
+ *
+ * Revision 1.19 1997/12/09 16:17:09 adam
+ * Fix bug regarding variants. Tags with prefix "var" was incorrectly
+ * interpreted as "start of variants". Now, only "var" indicates such
+ * start.
+ * Cleaned up data1_read_node so tag names and variant names are
+ * copied and not pointed to by the generated data1 tree. Data nodes
+ * still point to old buffer.
+ *
+ * Revision 1.18 1997/11/18 09:51:09 adam
+ * Removed element num_children from data1_node. Minor changes in
+ * data1 to Explain.
+ *
+ * Revision 1.17 1997/11/05 09:20:51 adam
+ * Minor change.
+ *
+ * Revision 1.16 1997/09/17 12:10:37 adam
+ * YAZ version 1.4.
+ *
+ * Revision 1.15 1997/09/05 09:50:57 adam
+ * Removed global data1_tabpath - uses data1_get_tabpath() instead.
+ *
+ * Revision 1.14 1997/05/14 06:54:04 adam
+ * C++ support.
+ *
+ * Revision 1.13 1996/10/29 13:35:38 adam
+ * Implemented data1_set_tabpath and data1_get_tabpath.
+ *
+ * Revision 1.12 1996/10/11 10:35:38 adam
+ * Fixed a bug that caused data1_read_node to core dump when no abstract
+ * syntax was defined in a "sgml"-record.
+ *
+ * Revision 1.11 1996/07/06 19:58:35 quinn
+ * System headerfiles gathered in yconfig
+ *
+ * Revision 1.10 1996/01/19 15:41:47 quinn
+ * Fixed uninitialized boolean.
+ *
+ * Revision 1.9 1996/01/17 14:52:47 adam
+ * Changed prototype for reader function parsed to data1_read_record.
+ *
+ * Revision 1.8 1995/12/15 16:20:41 quinn
+ * Added formatted text.
+ *
+ * Revision 1.7 1995/12/13 13:44:32 quinn
+ * Modified Data1-system to use nmem
+ *
+ * Revision 1.6 1995/12/12 16:37:08 quinn
+ * Added destroy element to data1_node.
+ *
+ * Revision 1.5 1995/12/11 15:22:37 quinn
+ * Added last_child field to the node.
+ * Rewrote schema-mapping.
+ *
+ * Revision 1.4 1995/11/13 09:27:36 quinn
+ * Fiddling with the variant stuff.
+ *
+ * Revision 1.3 1995/11/01 16:34:57 quinn
+ * Making data1 look for tables in data1_tabpath
+ *
+ * Revision 1.2 1995/11/01 13:54:48 quinn
+ * Minor adjustments
+ *
+ * Revision 1.1 1995/11/01 11:56:09 quinn