Reference Modification (↑ Statements)
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Construct: Reference Modification
Function: References part of a data item. The first item in the
parentheses is the leftmost character position; the second
item is the length.
Syntax:
►►─┬─data-name-1──────────────────────────┬──►
└─FUNCTION function-name-1─┬───────────┤
│ ┌───────┐ │
│ ▼ │ │
└─argument──┘
►──(─┬─integer-1─────────────────────┬─►
└─data-name-2──┬──────────────┬─┘
└─ ± integer-2─┘
►──:─┬─integer-3─────────────────────┬─)───►◄
└─data-name-3──┬──────────────┬─┘
└─ ± integer-4─┘
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