updategram in pg

[SunWuKung <Balazs(dot)Klein(at)axelero(dot)hu>]

Is there a way to store update/insert logic in the data instead of 
writing db or application procedures to do that?

I am looking for something along the lines of MS updategrams like this:

<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram">
 <updg:sync>
  <updg:before></updg:before>
  <updg:after updg:returnid="x y" >
       <HumanResources.Shift updg:at-identity="x" Name="Day-Evening"
                        StartTime="1900-01-01 11:00:00.000"
                        EndTime="1900-01-01 19:00:00.000"
                        ModifiedDate="2004-01-01 00:00:00.000" />
       <HumanResources.Shift updg:at-identity="y" Name="Evening-Night"
                        StartTime="1900-01-01 19:00:00.000"
                        EndTime="1900-01-01 03:00:00.000"
                        ModifiedDate="2004-01-01 00:00:00.000" />
  </updg:after>
 </updg:sync>
</ROOT>

Thanks for the help.
Balázs