Service Identifier, which may be an individual service, a service
group, or a service implementation.
Element getScopedPoliciesRequest/serviceIdentifier : ServiceIdentifier[1 .. 1]
The serviceIdentifier element cannot have "xsi:nil" as an attribute.
The serviceIdentifier element in XML instance can be substituted with other elements.
XML Instance
Service Identifier, which may be an individual service, a service
group, or a service implementation.