Derived Properties

A derived property of a «block» depends upon other value properties of the «block». A constraint on the «block» provides the relationship between the derived property and other properties of the «block». A derived value property’s name begins with a slash (i.e., “/”) to indicate that it is derived. In the example, the value property, /myDerivedProperty, holds the summation of the two other value properties, as defined by the constraint.

Reference:

Friedenthal, S., Moore, A., & Steiner, R. (2012) A Practical Guide to SysML. Waltham, MA: Morgan Kaufmann. pg. 141