What does the 'TO' lock type represent?

Does anyone know what the 'TO' lock type stands for? I found in the Oracle documentation for 8i the following list of lock types:
http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76961/ch380.htm#28430
but 'TO' is not included. I'm having issues with 'TO' locks hanging around for a while after a call to the database from a web server. They eventually timeout after a minute or so, but I hoping the lock type would be a clue as to the reason.
Thanks,
Sam
Sam Santiago
[email protected]

I looked up the documentation too and noticed it wasn't mentioned. Here's the output from a query on DBA_LOCK showing that lock type:
SESSION_ID     LOCK_TYPE     MODE_HELD     MODE_REQUESTED     LOCK_ID1     LOCK_ID2     LAST_CONVERT     BLOCKING_OTHERS
9     TO     Row-X (SX)     None     635667     1     199     Not Blocking
9     TO     Row-X (SX)     None     635664     1     196     Not Blocking
9     TO     Row-X (SX)     None     601017     1     177     Not Blocking
9     TO     Row-X (SX)     None     600979     1     27     Not Blocking
These locks seem to linger around too.

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