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The following page has been changed by KevinWilliams:
http://wiki.apache.org/ws/Tuscany/TuscanyJava/DAS_Java_Overview/RDBDAS_Java_User_Guide/Change_History_Processing

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  Notice that only a single column is updated rahther than all columns.  This 
is because the SDO !ChangeSummary has enough fidelity to track changes on a 
property-by-property bases and the das has the ability to generate partial 
updates.
  
- When the das has completed its processing of the !ChangeSummary all generated 
statements are executed against the database.  In this trivial example there is 
only a single statement to execute.  However, if there is more than a single 
statement to execute -- possibly several INSERT/UPDATE and DELETE statements -- 
then the das will sort the set of statements accordng to its write operation 
ordering algorithm.
+ When the das has completed its processing of the !ChangeSummary all generated 
statements are executed against the database.  In this trivial example there is 
only a single statement to execute.  However, if there is more than a single 
statement to execute -- possibly many INSERT/UPDATE and DELETE statements -- 
then the das will sort the set of statements accordng to its write operation 
ordering algorithm.
  

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