Architecting and designing > NATO Architecture Framework (NAF) > NAF v3 > Creating Service-Oriented View products for NAF 3 > Drawing Services on NSOV diagrams for NAF 3 > Specifying constraints on Service attributes for NAF 3
  
Specifying constraints on Service attributes for NAF 3
You can specify NSOV-4a Service Constraints, such as Service Policies, on the attributes of a class stereotyped as «Service».
In System Architect, you have the ability to create two types of Services: high-level Services and low-level Services. You can relate low-level Services, specified using a Class definition of stereotype «Service», to high-level Services in the Related Low-Level Service property of a Service definition. You can specify constraints on the attributes of low-level Services.
1 Select a Class definition stereotyped as «Service».
2 On the Definition tab of the Class, on Page 2, type in the name of the attribute and the constraint equation.
For example, type availability > 95, where availability is the attribute being constrained.
3 To save the class definition, click OK.
Result
The constraint is listed in curly brackets in the first compartment of the class symbol, as shown in the following image.
This graphic is described in the surrounding text.
See also
Drawing Services on NSOV diagrams for NAF 3