Used to add a column to the data collected from the external XML sources. This is useful if you would like to set a default value for a column if the initial column is null, like a currency field.
Go to http://msdn2.microsoft.com/en-us/library/system.data.datacolumn.expression(VS.71).aspx for more information.
Example:
<AddColumn>
<Column>
<ColumnName>ZeroOfGroup1</ColumnName>
<ColumnType>System.Int32</ColumnType>
<Expression>IsNull(1*[Group Value0], 0)</Expression>
</Column>
<Column>…</Column>
</AddColumn>
The name of the column you want to add.
The type of column you want to add. Please see Convert XML/ColumnType for available options.
The expression used to store data within the column.