Zille Huma and Christian Gerth and Gregor Engels: On-the-Fly Computing: Automatic Service Discovery and Composition in Heterogeneous Domains. In Computer Science - Research and Development, vol. 30, no. 3-4, pp. 333--361 (2015)
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@article{Huma14, author = {Zille Huma and Christian Gerth and Gregor Engels}, title = {On-the-Fly Computing: Automatic Service Discovery and Composition in Heterogeneous Domains}, journal = {Computer Science - Research and Development}, year = {2015}, volume = {30}, number = {3-4}, pages = {333--361} }

Zille Huma and Muhammad Rehman and Nadeem Iftikhar: An Ontology-Based Framework for Semi-Automatic Schema Integration. In Journal of Computer Science and Technology, vol. 20, no. 6, pp. 788--796 (2005)
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@article{HRI05, author = {Zille Huma and Muhammad Rehman and Nadeem Iftikhar}, title = {An Ontology-Based Framework for Semi-Automatic Schema Integration}, journal = {Journal of Computer Science and Technology}, year = {2005}, volume = {20}, number = {6}, pages = {788--796}, month = {November} }

Currently, schema integration frameworks use approaches like rule-based, machine learning, etc. This paper presents an ontology-based wrapper-mediator framework that uses both the rule-based and machine learning strategies at the same time. The proposed framework uses global and local ontologies for resolving syntactic and semantic heterogeneity, and XML for interoperability. The concepts in the candidate schemas are merged on the basis of the similarity coefficient, which is calculated using the defined rules and the prior mappings stored in the case-base.

Simon Schwichtenberg and Christian Gerth and Zille Huma and Gregor Engels: Normalizing Heterogeneous Service Description Models with Generated QVT Transformations. In Proceedings of the 10th European Conference on Modelling Foundations and Applications (ECMFA'14). Springer, LNCS, vol. 8569, pp. 180-195 (2014)
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@inproceedings{schwichtenberg2014normalizing, author = {Simon Schwichtenberg and Christian Gerth and Zille Huma and Gregor Engels}, title = {Normalizing Heterogeneous Service Description Models with Generated QVT Transformations}, booktitle = {Proceedings of the 10th European Conference on Modelling Foundations and Applications (ECMFA'14)}, year = {2014}, volume = {8569}, series = {LNCS}, pages = {180-195}, publisher = {Springer} }

Service Oriented Architectures (SOAs) enable the reuse and substitution of software services to develop highly flexible software systems. To benefit from the growing plethora of available services, sophisticated service discovery approaches are needed that bring service requests and offers together. Such approaches rely on rich service descriptions, which specify also the behavior of provided/requested services, e.g., by pre- and postconditions of operations. As a base for the specification a data schema is used, which specifies the used data types and their relations. However, data schemas are typically heterogeneous wrt. their structure and terminology, since they are created individually in their diverse application contexts. As a consequence the behavioral models that are typed over the heterogeneous data schemas, cannot be compared directly. In this paper, we present an holistic approach to normalize rich service description models to enable behavior-aware service discovery. The approach consists of a matching algorithm that helps to resolve structural and terminological heterogeneity in data schemas by exploiting domain-specific background ontologies. The resulting data schema mappings are represented in terms of Query View Transformation (QVT) relations that even reflect complex n:m correspondences. By executing the transformation, behavioral models are automatically normalized, which is a prerequisite for a behavior-aware operation matching.

Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig: Automated Service Composition for On-the-Fly SOAs. In Proceedings of the 11th International Conference on Service Oriented Computing (ICSOC'13). Springer-Verlag (Berlin/Heidelberg), LNCS , vol. 8274, pp. 524--532 (2013)
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@inproceedings{ICSOC13, author = {Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig}, title = {Automated Service Composition for On-the-Fly SOAs}, booktitle = {Proceedings of the 11th International Conference on Service Oriented Computing (ICSOC'13)}, year = {2013}, volume = {8274}, series = {LNCS }, pages = {524--532}, address = {Berlin/Heidelberg}, publisher = {Springer-Verlag} }

In the service-oriented computing domain, the number of available software services steadily increased in recent years, favored by the rise of cloud computing with its attached delivery models like Software as-a-Service (SaaS). To fully leverage the opportunities provided by these services for developing highly flexible and aligned SOA, integration of new services as well as the substitution of existing services must be simplified. As a consequence, approaches for automated and accurate service discovery and composition are needed. In this paper, we propose an automatic service composition approach as an extension to our earlier work on automatic service discovery. To ensure accurate results, it matches the service request and available offers based on their structural as well as behavioral aspects. Afterwards, possible service compositions are determined by composing the service protocols through a composition strategy based on labeled transition systems.

Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig: Towards an Automatic Service Discovery for UML-based Rich Service Descriptions. In Proceedings of the ACM/IEEE 15th International Conference on Model Driven Engineering Languages and Systems (MODELS'12). Springer-Verlag (Berlin/Heidelberg), LNCS, vol. 7590, pp. 709-725 (2012)
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@inproceedings{Models2012, author = {Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig}, title = {Towards an Automatic Service Discovery for UML-based Rich Service Descriptions}, booktitle = {Proceedings of the ACM/IEEE 15th International Conference on Model Driven Engineering Languages and Systems (MODELS'12)}, year = {2012}, volume = {7590}, series = {LNCS}, pages = {709-725}, address = {Berlin/Heidelberg}, publisher = {Springer-Verlag} }

Service-oriented computing (SOC) promises to solve many issues in the area of distributed software development, e.g. the realization of the loose coupling pattern in practice through service discovery and invocation. For this purpose, service descriptions must comprise structural as well as behavioral information of the services otherwise an accurate service discovery is not possible. We addressed this issue in our previous paper and proposed a UML-based rich service description language (RSDL) providing comprehensive notations to specify service requests and offers. However, the automatic matching of service requests and offers specified in a RSDL for the purpose of service discovery is a complex task, due to multifaceted heterogeneity of the service partners. This heterogeneity includes the use of different underlying ontologies or different levels of granularity in the specification itself resulting in complex mappings between service requests and offers. In this paper, we present an automatic matching mechanism for service requests and offers specified in a RSDL that overcomes the underlying heterogeneity of the service partners.

Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig: A UML-based Rich Service Description Language for Automatic Service Discovery of Heterogeneous Service Partners. In Proceedings of the Forum at the CAiSE'12 Conference on Advanced Information Systems Engineering. CEUR-WS.org, CEUR Workshop Proceedings, vol. 855, pp. 90--97 (2012)
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@inproceedings{CAiSE12_Huma_Gerth, author = {Zille Huma and Christian Gerth and Gregor Engels and Oliver Juwig}, title = {A UML-based Rich Service Description Language for Automatic Service Discovery of Heterogeneous Service Partners}, booktitle = {Proceedings of the Forum at the CAiSE'12 Conference on Advanced Information Systems Engineering}, year = {2012}, volume = {855}, series = {CEUR Workshop Proceedings}, pages = {90--97}, publisher = {CEUR-WS.org} }

Service-oriented computing (SOC) emerges as a promising trend solving many issues in distributed software development. Following the essence of SOC, service descriptions are dened by the service partners in their independent heterogeneous domains based on current standards, such as, WSDL. However, these standards are mostly syntactic and do not provide any semantic description which may lead to inaccurate service discovery results. Currently many research efforts aim at formulating rich service descriptions for service partners comprising syntactic as well as semantic information. However, due to the underlying heterogeneity of service partners in terms of different underlying ontologies, different description notations, etc., matching of rich service descriptions for accurate service discovery is a complex task. In this paper, we come up with a proposal for rich service descriptions based on the UML.

Zille Huma and Christian Gerth and Gregor Engels: Automated Service Discovery and Composition for On-the-Fly SOAs. no. tr-ri-13-333. University of Paderborn, Germany (2013)
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@techreport{tr-ri-13-333, author = {Zille Huma and Christian Gerth and Gregor Engels}, title = {Automated Service Discovery and Composition for On-the-Fly SOAs}, institution = {University of Paderborn, Germany}, year = {2013}, number = {tr-ri-13-333} }