The following schema represents a customer and account:
bank
*customer
age
*account
baseInterestRate
actualInterestRate
In this example the bank, customer and account are composite
elements. Customer and account are repeating elements. The age is
of type int and baseInterestRate and actualInterestRate are of type
float. The bank can have many customers and each customer can have
multiple accounts. Each account has a base interest rate and actual
interest rate. Actual interest rate is a computed element and depends
on base interest rate and customer’s age. Assume expression for
acualInterestRate is baseInterestRate + (age >= 60 ? 0.5:0.0).
At runtime expression manager is provided following values for age and
baseInterestRate:
age: [20, 61]
baseInterestRate: [[7, 8][7.5, 8, 8.5]]
After flattening these variables, the following two-dimensional
array is created:
20 7
20 8
61 7.5
61 8
61 8.5
Age elements are repeated multiple times according to number
of elements in baseInterestRates. Expression is evaluated for each
of these rows. After evaluating expressions, results are arranged
in the same hierarchy as the input variable baseInterestRate. The
variable with most number of repeating levels is considered because
expression is always at the deepest level and does not use variables
which are further down in hierarchy. API returns the result as [[7, 8][8, 8.5, 9]].
