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Examples of expression statements for restrictions include:

• Equipment class equal to ‘XXX ‘ (compare database value to some constant)

• Equipment class begins with ‘XXX%’ (compare partial database value to some constant).

• Quantity greater than or equal to 10 (compare database value to some constant)

• Fuel gallons greater than fuel capacity (compare two database values)

• Compare dates

• Date difference greater or less than a constant