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shared between services the desired service
will be created. This approach will motivate
the workflow designers to ask for new virtual
Web Services that this new model can create.
In addition, the workflows reusability is an
important factor because the workflows will
be stored in internal repositories to possibly
take benefit from their functionality over and
over.
4. Dynamic Composition of Web Services:
Because the Web Services in this model
have the same root metadata ontology, it
will be easier to compose services based on
semantic goals. And this dynamic composi-
tion means that the composed services will
be registered within the cloud that it had
been created in, and if it is shared between
one or more clouds then it will be registered
within all of them.
5. Categorizing of Web Services in Clouds:
This will provide a second level of clas-
sification together with the traditional one
in the service directories and this will make
the WS searching mechanism more powerful
and will improve the response time of the
discovery phase activities and the perfor-
mance as a whole.
6. Advertisement of New Web Services: In
the case of desired functionalities absence,
advertisements of new Web Services that
implement such functionalities will be for-
warded to the WS providers.
Services within the model will be done where we
can divide the WS objects into slices and forward
these slices to the service providers to implement
them as separate Web Services. Such a concept
will be a great improvement for both consumer
and provider sides.
From the consumer's perspective the main
enhancements will be to find out that the security
of information in the confidential context is highly
enriched while from the provider's perspective the
advantage is to deal with much more primitive
data structures. As a result, the chance to reuse a
Web Service will be highly improved.
Another important direction in our future work
is how to ensure the availability of information
within the model by proposing possible criteria to
group Web Services like: I/O scalability or data
redundancy…
Business architecture together with high-level
semantic information model will be specified
where the busincess architecture will act as a
bridge between the adopted busines context and
the semantic SOA-beased model; and the semantic
information model will identify the major busi-
ness entities and documents within the semantic
SOA-based reference architecture.
A concrete methodology to perform dynamic
Web Service composition will be defined. Trust
and security issues also will be part of the future
work.
concLusion
future reseArch directions
In this chapter, the main focus was to introduce
an ontological SOA-based model that deals with
Semantic Web Services in order to apply it to
one of the SOA-based business solutions like
FERP system.
One of the main purposes of this model is to
group the Web Services based on the actual domain
that they are related to (the area of interest). All
the components that are composing this model
Our future directions will mainly focus on the
model enhancement side by side with the imple-
mentation of full reference architecture out of this
reference model. This will be done by checking
the various data storage techniques that will be
involved in the new model. Study of how to ob-
fuscate information in order to use untrusted Web
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