WWW 2008 / Workshop Summary April 21-25, 2008 · Beijing, China WS3 - International Workshop on Context-Enabled Source and Service Selection, Integration and Adaptation (CSSSIA 2008) School of Computer Science The University of Adelaide Adelaide, SA 5005, Australia Quan Z. Sheng qsheng@cs.adelaide.edu.au IBM India Research Lab Institutional Area, Vasant Kunj New Delhi, India IBM India Research Lab Institutional Area, Vasant Kunj New Delhi, India Ullas Nambiar ubnambiar@in.ibm.com College of Info. Tech. Zayed University Dubai, UAE College of Engi. & Comp. Sci. Wright State University Dayton, OH, USA Amit P. Sheth amit.sheth@wright.edu College of Info. Tech. UAE University Al-Ain, UAE Biplav Srivastava Zakaria Maamr Said Elnaffar sbiplav@in.ibm.com zakaria.maamar@zu.ac.ae elnaffar@uaeu.ac.ae ABSTRACT This write-up provides a summary of the International Workshop on Context enabled Source and Service Selection, Integration and Adaptation (CSSSIA 2008), organized in conjunction with WWW 2008, at Beijing, China on April 22nd 2008. We outline the motivation for organizing the workshop, briefly describ e the organizational details and program of the workshop, and summarize each of the pap ers accepted by the workshop. More information ab out the workshop can b e found at http://www.cs.adelaide.edu.au/csssia08/. Categories and Subject Descriptors H.3.5 [Information Systems]: Online Information Services--Web-based services ; H.2.8 [Information Systems]: Database applications General Terms Design, Management Keywords Context awareness, Web service, service and data integration 1. WORKSHOP GOALS Context awareness refers to the capability of an application or a service b eing aware of its physical environment or situation (i.e., context) and resp onding proactively and intelligently based on such awareness [1]. With recent developments in computer hardware, software, networking, and sensor technologies, context awareness b ecomes one of the most exciting trends in computing today that holds the p otential to make our daily life more productive, convenient, and enjoyable. Service integration has the purp ose of providing the final user with a single unified service, hiding the distribution and Copyright is held by the author/owner(s). WWW 2008, April 21­25, 2008, Beijing, China. ACM 978-1-60558-085-2/08/04. heterogeneity of the services provided by the autonomous providers. Generally, service integration approaches have focused more on process modeling and execution asp ects than on data integration, while the latter is often the most crucial determiner of successful integration in practice. Through the use of context, a new generation of Web services (i.e., context-aware Web services) is exp ected to arise for the b enefit of coping with the dynamic nature of the Internet. For instance, the b est service provider in terms of quality guarantees and cost metrics would differ from time to time. A comp osite service provider must therefore regularly change the services invoked to provide the b est service to his customers. The task of identifying the b est service to invoke is the biggest challenge to overcome and necessitates techniques for detecting data and functionality changes in a service, methods for assessing the quality of the service, computing the cost of invocation etc. Although the combination of context awareness and Web service comp osition sounds app ealing, injecting context into adaptive service integration and management raises a numb er of significant challenges, which have not b een widely recognized or addressed by the Web services community. Some of them are: a) how to build a model of change: data, process and environment? b) how, when and where to track the provenance of data and meta-data? c) how to define and use effective and practical metrics to manage adaptation: how to compare ability of different services to adapt? How to compare different middleware? d) what is the role of context and how to get the right one? The ob jective of CSSSIA 2008 is to provide a forum for researchers and practitioners to exchange new ideas, developments, and exp eriences on the key technical challenges for deployment of context-enabled, adaptive Web services and integrated applications. Discussions focus on where the state of the art is and where the challenges lie, and what practices are needed to enable and sustain a bright future of this research area. 2. WORKSHOP ORGANIZATION The Organizing Committee of CSSSIA 2008 consists of 1263 WWW 2008 / Workshop Summary Quan Z. Sheng, Ullas Nambiar, Amit Sheth, Biplav Srivastava, Zakaria Maamar, and Said Elnaffar. The Technical Program Committee includes 29 internationally active researchers in this area. The call-for-pap ers (CFP) of CSSSIA 2008 has b een widely circulated in the research community. There were thirteen pap ers submitted from twelve different countries. All the submissions were of high quality and presented many interesting asp ects of Web service discovery, comp osition and use. Each pap er was reviewed by at least three memb ers of the Program Committee. Based on the reviews and the subsequent discussions, the international Program Committee eventually selected six full pap ers and three short pap ers. It is our intention to select a sufficient numb er of pap ers that would cover, as wide as p ossible, the ma jority of core research domains targeted by CSSSIA 2008. The workshop proceedings is published as an ACM International Conference Proceeding Series (AICPS) volume [2], which is available at the ACM Digital Library. April 21-25, 2008 · Beijing, China requirement context such as timed and business relations among process tasks. Web service integration is an imp ortant technology for the effective automation of application-to-application collab orations. The pap er by Harney and Doshi Speeding Up Web Service Composition with Volatile External Information, rep orts a novel method called informed-presumptive for fast comp osing Web services in the presence of external volatile information. Segev in Circular Context-Based Semantic Matching to Identify Web Service Composition, describ es a work-in-progress that focuses on a new technique for identifying the comp osibility of two Web services based on contextual similarity. Han et al. in A New Aggregation Policy for RSS Services, describ e an aggregation algorithm for minimizing the numb er of missing p ostings within an aggregation of RSS (Rich Site Summary) services. The pap er by Leung et al. Toward A Model of Service Interaction Enabler in Mobile Environment, looks at the problem of context-based service interactions in mobile environments. It presents a device capability model for capturing the capability of a mobile device and an approach for analyzing the interaction p ossibility b etween devices. The pap ers accepted at CSSSIA 2008 cover a wide range of topics in context-aware service selection, integration, and adaptation and present some of the key directions in this research area. Although many of these pap ers represent early results of ongoing research activities, the work rep orted in these pap ers and the research issues raised there make significant contributions in leading to broader discussions on the research and development of context-aware services and applications. We hop e the set of selected pap ers provides the community with a b etter understanding of the current directions and areas to focus in future. 3. WORKSHOP PROGRAM Prof. Schahram Dustdar from the Vienna University of Technology, Austria gives the keynote sp eech titled Research Chal lenges in Designing Complex Autonomic Service-Oriented Systems. In his talk, Prof. Dustdar focuses on the increasing need for business processes and software services to attain higher degrees of autonomic, context-aware, and self-adaptive b ehavior due to the increasing complexity and interdep endence of computing devices with the underlying information systems, as well as processes involving humans and software services. He highlights the main research challenges for this class of problems and presents the current state in building the required novel conceptual abstractions as well as needed technological implementations and validations. Apart from the keynote sp eech, the program features four sessions. The first three sessions are structured to include presentations by the authors of the accepted pap ers, followed by a group discussion. The last session is devoted to a panel discussion of imp ortant research issues of context-aware service selection, integration, and adaptation. Finding desired Web services is crucial to the success of many Web services applications. Ma and Zhang in Efficiently Finding Web Services Using a Clustering Semantic Approach, present a two-phase approach for efficiently detecting Web services. The pap er by Dietze et al. titled Enabling Context-aware Semantic Web Service Discovery through Conceptual Situation Spaces, prop oses Conceptual Situation Spaces (CSS) to capture situational contexts of Web services. CSS are mapp ed to standardized semantic Web service (SWS) representations such as Web Service Modelling Ontology (WSMO) to enable the context-aware discovery of Web services. In Using Context to Enable Semantic Mediation in Web Service Communities, Mrissa et al., address the problem of semantic heterogeneity b etween memb er Web services and service communities by prop osing a semantic mediation mechanism. Herssens et al. introduce a service selection framework based on Quality of Service (QoS) considerations in Using QoS with Multi-Criteria Methods to Lead Service Selection. The pap er by Yu et al. Composite Process Oriented Service Discovery with Preserving Business and Timed Relation, addresses the service selection for comp osite processes by considering particular 4. ACKNOWLEDGMENTS We would like to thank all the program committee memb ers who help ed us organize the workshop and for providing very useful and thoughtful feedback to the authors. We would also like to thank all the authors who submitted their pap ers to the workshop; they provided us with an excellent workshop program. A very sp ecial thanks to the WWW 2008 organization committees for helping with the logistics of the workshop. 5. REFERENCES [1] G. D. Ab owd, M. Ebling, G. Hunt, H. Lei, and H.-W. Gellersen. Context-Aware Computing. IEEE Pervasive Computing, 1(3):22­23, 2002. [2] Q. Z. Sheng, U. Nambiar, A. P. Sheth, B. Srivastava, Z. Maamar, and S. Elnaffar. Proc. of the Intl. Workshop on Context enabled Source and Service Selection, Integration and Adaptation (CSSSIA'08). Beijing, China, April 2008. 1264