Two rows are added to the Spreadsheet pane, above
the target element:
- In the first row, Map Script is set to "if". You cannot enter
anything in the Value column of this row.
- In the second row, Map Script is set to "condition". Its value
is an expression that is evaluated to see whether it is true. If true,
the target element is set to the value specified in its "Value" column.
Initially, its "Value" column is set to ‘fn:true()’, which means that
the condition is always met, and the target element is always set
to the "Value" column.