Property-specific initial values (a.k.a. Property-specific default values^(*)) are specific to the usage of a Block as a part Property in a higher context (by a structured block or "assembly"), and if there are many part Properties of the same type, they may have different property-specific default values (i.e. they will be initialised differently). They are managed by the higher context structured block that owns the part Properties, which initialises or configures their (possibly different) values on instantiation. In our example an abstract Vehicle block will configure its tank:FuelTank part Property by initialising it with a new capacity value.

The property-specific initial values of a part Property are carried by the Slots of an InstanceSpecification of the same type. In the example below have stereotyped the InstanceSpecification tank:FuelTank with «initial values», however this is only for illustration. If you have many parts to configure you may also like to group them in a dedicated Model (I have used a Model named parts below, with a custom stereotype «initialisation»).

Next we will see how to assign these property-specific initial values carries by the Slots of the tank:FuelTank InstanceSpecification to override the static (class-level) default for the capacity ValueProperty in the part tank:FuelTank in the Internal Block Diagram (IBD) for Vehicle.

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