You can do comparisons and assignments in a few different ways:

To make the examples more interesting and allow for a bit more complexity in the rules, the basic Tutorial Vocabulary (Cargo.ecore) was extended to include a few more attributes. The extended Vocabulary is shown in the following figure:

Figure 1. Basic Tutorial Vocabulary Extended

The new attributes are described in the following table:

Table 1. New attributes added to the Basic Tutorial Vocabulary
Attribute Data type Description
Aircraft.emptyWeight Decimal The weight of an aircraft with no fuel or cargo onboard (kilograms.)
Aircraft.grossWeight Decimal The maximum amount of weight an aircraft can safely lift, equal to the sum of cargo and fuel weights (kilograms.)
Aircraft.maxfuel Decimal The maximum amount of fuel an aircraft can carry (liters.)
Cargo.footprint Decimal The floor space required for this cargo. (square meters.)
FlightPlan.approved Boolean Indicates whether the flight plan is approved for operation.
FlightPlan.planWeight Decimal The total amount of all aircraft and cargo weights for this flight plan (kilograms.)
FlightPlan.flightRange Decimal The distance the aircraft is expected to fly (kilometers.)
FlightPlan.fuel Decimal The amount of fuel loaded on the aircraft assigned to this flight plan (liters.)