In the meantime:
- add_ibm_db2.diff — changes to existing files against r43499 of the trunk
- includes/db/DatabaseIbm_db2.php — Database API
- includes/SearchIBM_DB2.php — primitive search module
- maintenances/ibm_db2/tables.sql — database definition
There is a very good reason for the filenames.
This is all under GPL, so don’t look at it if you work on closed-source wikis.;-)