In this thesis, a web service composition and execution framework is presented for semantically
annotated web services. A monolithic approach to automated web service composition
and execution problem is chosen, which provides some benefits by separating the composition
and execution phases. An AI planning method using a logical formalism called Event
Calculus is chosen for the composition phase. This formalism allows one to generate a narrative
of actions and temporal orderings using abductive planning techniques given a goal.
Functional properties of services, namely input/output/precondition/effects(IOPE) are taken
into consideration in the composition phase and non-functional properties, namely quality of
service (QoS) parameters are used in selecting the most appropriate solution to be executed.
The repository of OWL-S semanticWeb services are translated to Event Calculus axioms and
the resulting plans found by the Abductive Event Calculus Planner are converted to graphs.
These graphs can be sorted according to a score calculated using the defined quality of service
parameters of the atomic services in the composition to determine the optimal solution. The
selected graph is converted to an OWL-S file which is executed consequently.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611082/index.pdf |
| Date | 01 September 2009 |
| Creators | Okutan, Cagla |
| Contributors | Cicekli, Nihan Kesim |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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