Fatima-Zahra Belouadha

Ibrahim El Bitar, Fatima-Zahra Belouadha, Ounsa Roudies

The semantic Web service discovery has been given massive attention within the last few years. With the increasing number of Web services available on the web, looking for a particular service has become very difficult, especially with the evolution of the clients needs. In this context, various approaches to discover semantic Web services have been proposed. In this paper, we compare these approaches in order to assess their maturity and their adaptation to the current domain requirements. The outcome of this comparison will help us to identify the mechanisms that constitute the strengths of the existing approaches, and thereafter will serve as guideline to determine the basis for a discovery approach more adapted to the current context of Web services.

Hajar Omrana, Fatima-Zahra Belouadha, Ounsa Roudies

Non Functional Properties (NFPs) such as security, quality of service and business related properties enhance the service description and provide necessary information about the fitness of its behaviour. These properties have become crucial criteria for efficient selection and composition of Web services. However, they belong to different domains, are complex, change frequently and have to be semantically described. The W3C standard WSPolicy,recommended to describe these properties doesn t define standardized specifications that cover all NFPs domains. Moreover, it doesn t provide an easy manner to express them independently of domains, and doesn t support their semantic. This paper proposes a Model driven approach to describe and automatically generate enriched Web services including semantic NFPs. It explores both the use of the OMG Profile for Modelling and Analysis of Real-Time Embedded Systems (MARTE) and the W3C standards. Mapping rules, from NFPs profile to WS-Policy and SAWSDL files, transforms NFPs into policies associated with WSDL elements.

Hajar Omrana, Safae Nassiri, Fatima-Zahra Belouadha et al.

In the last five years, Moroccan e-health system has focused on improving the quality of patient care services by making use of advanced Information and Communications Technologies (ICT) solutions. In actual fact, achieving runtime and efficient information sharing, through large-scale distributed environments such as e-health system, is not a trivial task. It seems to present many issues due to the heterogeneity and complex nature of data resources. This concerns, in particular, Moroccan Hospital Pharmacy Information System (HPIS) which needs to interact with several disparate medical information systems. Service Oriented Architecture (SOA) offers solution that is both flexible and practical to effectively address the problem of interoperability of e-health systems. In this paper, we discuss the limits and challenges of the current Moroccan information system intended for hospital pharmacy. We therefore propose a global Web services-based e-health architecture for integrating different heterogeneous blocks and various data resources of this system. We also present a solution to secure Web services communication using WS-SecurityPolicy.

Fatima-Zahra Belouadha, Hajar Omrana, Ounsa Roudiès

In a global business context with continuous changes, the enterprises have to enhance their operational efficiency, to react more quickly, to ensure the flexibility of their business processes, and to build new collaboration pathways with external partners. To achieve this goal, they must use e-business methods, mechanisms and techniques while capitalizing on the potential of new information and communication technologies. In this context, we propose a standards, model and Web services-based approach for modeling and integrating agile enterprise business processes. The purpose is to benefit from Web services characteristics to enhance the processes design and realize their dynamic integration. The choice of focusing on Web services is essentially justified by their broad adoption by enterprises as well as their capability to warranty interoperability between both intra and inter-enterprises systems. Thereby, we propose in this chapter a metamodel for describing business processes, and discuss their dynamic integration by addressing the Web services discovery issue. On the one hand, the proposed metamodel is in line with the W3C Web services standards, namely, WSDL, SAWSDL and WS-Policy. It considers the use of BPMN standard to describe the behavioral aspect of business processes and completes their design using UML diagrams describing their functional, non-functional and semantic aspects. On other hand, our approach for integrating processes is in line with BPEL standard recommended to orchestrate Web services. To realize executable business processes, this approach recommends the use of semantic matching and selection mechanisms in order to produce agile systems.

Fatima-Zahra Belouadha, Hajar Omrana, Ounsa Roudies

A lot of works has been especially interested to the functional aspect of Web services. Nevertheless, it is necessary to describe their non-functional properties such as the security characteristics and the quality of service. The WS-Policy standard was recommended in 2007 to describe Web services policies including the non-functional properties. However, it doesn't provide any information of their meaning necessary for automatic processes. In this paper, we propose a Model Driven Architecture approach founded on W3C standards to generate WSDL language based files including semantic policies. We use a package of WSDL and WS-Policy profiles and transformations rules to generate Web services interfaces files including policies. We extend a XML schema profile according to SAWSDL standard to define semantic non-functional properties domains. This work contributes to minimize the development cost of Web services including semantic policies. Moreover, the generated services can be automatically processed in discovery, selection and negotiation tasks.