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The following page has been changed by KevinWilliams:
http://wiki.apache.org/ws/WorkingWithOptimisticConcurrencyControl

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     </Config>
  }}}
  
+ This line in the config file ''<Column columnName="OCC" collision="true" 
managed="true"/>'' designates the column named "OCC" as the version column and 
also sets "managed" to true.  The "managed" attribuete has to do with how the 
version column is changed.  In order for OCC to work, somebody has to change 
the value of the version column each time the row is modified.  A new value in 
the version column is what tells the DAS that some agent has modified the row.  
If a version column is "managed" then the DAS is responsible for incrementing 
the value of the column each time some column in the row is changed.  The other 
option is "managed= false" and in this case, the DAS will assume some other 
agent is responsible for updating the version column.  This other agent is 
likely to be the client application itself or the database via a trigger or 
some other mechanism.
+ 

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