Abstract:
Most of the data in the internet are markup for text
and graphics in HTML format and are driven by syntax.
These data are displayed to the user but the computers
are concern there is no meaning of these data. If we
semantically annotate data in the internet, then the
computers can process these data in meaningful ways
and increase the usability of the data. In this project a
possible architecture for a semantics based
middleware agent (broker) will be looked at, which has
the capabilities to serve web service requests by
searching through a larger space of web services. The
matching capabilities of a semantics based broker are
much higher than any of the syntax based middleware
frameworks in the market today like UDDI.
In this project, we will be using two of the current
semantic web technologies OWL (Ontology Web
Language) and OWL-Services. Once the broker
receives a client request that contains the capabilities
and input/output specification of a web service client
wishes to invoke, it will read OWL-S descriptions of
the services registered to the broker and try to find a
direct match. If it is unable to find one the broker uses
its powerful inference capabilities (not available in
conventional syntax based middleware) to dynamically
compose a set of available services together into a new
service.
Our IntelliBroker works as a true broker in the
sense that client may even not know what the invoked
services are. In executing the created composite
service, the broker has the ability to exploit any
parallelism between the child services and return
results to the client faster. The broker will convert
OWL types to SOAP messages and vice versa using
XSLT (eXtensible Style Language Transformations).
This paper focuses on the design and the architectural
of our system.
We implemented the system with Java language and
used Axis framework for publishing and executing web ...
