Using the dollar sign ($)

The dollar sign can be used to refer to the object to the left of a rule cell.

For example, the component rule below applies to the component RunRule.

The RunRule in the rule can be replaced by $. You can remember it this way: a dollar sign always means whatever component appears to the left of the rule.

Here is an example of a map designer rule that uses the dollar sign:

Order:Invoice = MapMyOrder ( Order:PO , Index ( $ ) )

In this example, each time this rule is evaluated, the index of the Order:Invoice being built is the object referred to by the $.