* 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.
* 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.