The Property-specific initial values (a.k.a. the Property-specific defaultValue vector) of a part Property can be assigned in MD SysML using Drag n' Drop of an InstanceSpecification (of the same type as the part Property) from the browser onto the part Property in an Internal Block Diagram (IBD), as illustrated below. (You don't have to have the InstanceSpecification on the IBD, nor
show the illustrative <<initialises>> Dependency.)
On instantiation a (concrete subclass of a) Vehicle will (by default) now initialise the capacity value of the tank:FuelTank to 46.0 L, overriding the static ("class-level") primitive default value of 40.0L that was defined in FuelTank. Note that it is the context block Vehicle - the owner of the part Property tank:FuelTank - which "manages" all of the property-specific initial values and the initialisation of each part Property.
The designer of the abstract Vehicle block, has assumed that this property-specific initial value of the capacity value will suit a wide range of vehicles, so we will next see how this value is inherited in a generic Car.
