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Policies can be defined o
is important, since it allow
boundaries. The way the ab
situation and on design cho
we will use the term “speci
the policy abstracts from th
case to the other.
A management process
sion events and exchange e
tives and some rule base (fo
assertives. Management dis
ing assertives (“subscribe”)
on two levels, the “what” and the “how”. This abstract
ws for adaptation of the controlled system, within gi
bstract policy is enforced may depend on the (monitor
oices made by the controlling system [25]. In the followi
fication” for the enforced (and executable) policy. How
he specification is a design choice that will differ from
tion
ven
red)
ing,
w far
one
is like a REA economic process containing both conv
vents. For instance, an inference service uses certain as
formally, these are also assertive) in order to produce ot
scourse is based on an exchange duality balancing inco
) with outgoing ones (“publish”).
ver-
ser-
ther
om-
Fig. 3. Generic service model
3.3 Generic Service Mod
del
Our generic service model
service adds value to som
other resources. Including
has been argued for indepe
vice system and decompo
service goal, whereas coord
the dependencies between -
the policy . We model subse
ontology, they are related to
Management services have
adds value to a service. Th
active role in the operatio
enforcing one or more servi
The service model is inte
such as a transport, or a ha
the transport case: the reso
trol and the driver's labor
l is based on [23] and illustrated informally in Fig. 3
me resource , called its goal, consuming or making use
the resources in the service model is in line with REA
endently by [16]. A service can be regarded as a small
sed into subservices . Core subservices contribute to
dination services are subservices that coordinate - man
- core subservices [24], using a specification derived fr
ervices with a part-of relationship, but in terms of the R
o the super service by a use relationship just like resourc
e been defined in [23] as a kind of enhancing services t
hey are not subservices of the service in question, with
onal process, but manipulate the (operational) service
ice policies.
ended to be generic. It can be applied to business servic
air-dressing, but also to a software service. Let us illustr
urces that are used or consumed include the lorry, the
hours, each of them having a certain value. The transp
3. A
e of
and
ser-
the
nage
rom
REA
ces.
that
h an
by
ces,
rate
pe-
port
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