The heading of service diagrams is:
<service-heading> ::= service [<qualifier>] <service-name>
while service type diagrams have the following heading:
<service-type-heading>::=
[<
virtuality
>]
service type [<
qualifier
>] <service-type-name>
[<formal-context-parameters>]
[<
virtuality-constraint
>][<
specialisation
>]