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Majority of the existing approaches to service composition, including the widely popular planning based techniques, are not able to automatically compose practical workflows that include complex repetitive behaviors (loops), taking into account possibility of failures and non-determinism of web service execution results. In this work, we present a learning based approach for composing task specific...
Majority of service discovery research considers only primitive services as a suitable match for a given query while service combinations are not allowed. However, many realistic queries cannot be matched by individual services and only a combination of several services can satisfy such queries. Allowing service combinations or proper compositions of primitive services as a valid match introduces...
In most of research, service composition and discovery are treated separately. In the composition, it is assumed that primitive services are known to the composition component in advance. At the same time, in matchmaking algorithms, usually only one service is considered as a suitable candidate satisfying a query while service combinations are not allowed. The problem is that in realistic composition...
Web Services providing access to datasources with structured data have an important place in the SOA. In this paper we focus on modeling and discovery of generic data providing services (DPS), with the goal of making data providing services available for interactions with service requesters in contexts such as service composition and mediation. In our model RDF Views are used to represent the content...
In this paper we present an approach for specification of exception handling and recovery of semantic web services based on OWLS. We use standard fault handlers and compensation known for example from WS-BPEL to provide support for long running transactions. In addition to that, we introduce constraint violation handlers (CV-handlers) which allow a designer to define what situations are supposed to...
In this paper we describe mechanisms for execution monitoring of semantic Web services, based on OWL-S. The use of semantic descriptions and ontologies is a valuable extension to current SOA conceptualizations. The described mechanisms are implemented as extensions of the OWL-S virtual machine that we have previously developed. The OWL-S virtual machine is a component that controls the interactions...
The framework for automatic mediation of two process models composed of semantically annotated Web services is presented. Process mediation is hard because of many possible mismatches between process models. We introduce algorithms for the process models analysis to find possible mappings between provider's and requester's process models, or to identify incompatibilities that cannot be reconciled...
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