Dominik Zyskowski

Architecture for Web Services Filtering and Clustering

The need for filtering of services results from the ever growing number of available Web services which offer similar functionalities. The filtering process is based not only on the functional aspects of services, but also on non-functional ones. One of the weaknesses of the filtering process is lack of high efficiency and its complexity as processing ontological descriptions and reasoning on them is extremely time-consuming. In order to speed-up the filtering process, clustering techniques that would narrow the set of potential services which meet users preferences may be introduced. In this article the architecture for Semantic Web services filtering and clustering system is shortly discussed.

Duality in Web Services Reliability

The Web services technology allows for easy creation of complex applications consisting of smaller components - Web services. This article performs an in-depth analysis of a Web services’ reliability problem for both atomic and composite web services. Is there really a problem of low reliability for composite applications?

Architecture for Service Profiling

Service oriented architecture is gaining momentum. However, in order to be successful, the proper and up-to-date description of services is required. Such a description may be provided by service profiling mechanisms, such as one presented in this article. Service profile can be defined as an up-to-date description of a subset of non-functional properties of a service. It allows for service comparison on the basis of non-functional parameters, and choosing the service which is most suited to the needs of a user. In this article the notion of a service profile along with service profiling mechanism is presented as well as the architecture of a profiling system

Semantic Web Services Applications - a Reality Check

ZusammenfassungDer Aufsatz gibt einen Überblick über den Entwicklungsstand der Technologie von Semantic-Web-Services. Im Mittelpunkt steht der Vergleich zwischen der akademischen Forschung und der tatsächlichen Akzeptanz in der Wirtschaft. Der Beitrag schließt mit einer Betrachtung der Gründe für die zögerliche Anwendung der Technologie.AbstractThis article aims at providing an overview of the current state of development of Semantic Web services technology. The focus is on a comparison between the research held in the academia and the Semantic Web services adoption in the industry. The reasons that hamper the application of this technology are also given.

Application-oriented Web services filtering

The issue of information overload is quite well resolved in the area of textual documents available on the net by using the paradigm of information filtering. However, as the idea of applications of Internet is still changing and evolving into the more and more dynamic concept connected with the paradigm of Web services, there also appears a need for filtering of different objects. In this paper the concept of application-oriented Web services filtering is discussed. As the proof-of-concept the F-WebS (filtering of Web services) system is presented.

Semantic Modelling of Collaborative Business Processes

Business collaboration is a special type of a business process that involves at least two, but typically more partners and usually is described using a choreography model. The complexity of collaborative business processes causes difficulties in modelling them in a user friendly manner and even more difficulties in representing them in a machine understandable form. The main goal of this paper is to discuss the scope of the semantic support that is required for the needs of automation of collaborative business processes as well as possible benefits resulting from machine readable annotation of choreography models.

Decomposition of SQuaRE – Based Requirements for the Needs of SOA Applications

The quality is perceived as a very important aspect of software applications. There exists widely accepted by both IT and business professionals SQuaRE model used to express the quality requirements towards applications. Nowadays, many applications are developed in accordance with the SOA paradigm and taking advantage of reusable components i.e. Web services. Therefore, a need appears to decompose the quality requirements expressed on the level of application to the level of components used to create the application. The problem with such decomposition is twofold. First of all, a quality model for Web services and SOA based applications is still a work in progress and neither of suggested approaches has been accepted as a standard. Second problem is connected with the user-oriented perception of the SQuaRE model and technical perspective of WS. Within this article we show how requirements defined within the SQuaRE model may be mapped to Web services QoS attributes. We advocate that ontological representation of quality models may provide common understanding of the attributes as well as it facilitates decomposition of business requirements to strictly technical ones. Nevertheless, due to the different perception the full automation of this process seems to be impossible.

NFP Ontology for Discovery and Sharing Web Services in Distributed Registries

The success of Web services technology depends heavily on the effective discovery and sharing of services in distributed environments using various registries. These tasks should take into account both functional and non-functional properties (NFP) of a service. Such properties may be for example: execution time, reliability, security, cost or providers reputation. However, currently known approaches focus mainly on the functional attributes of Web services and there is an ongoing discussion on the scope and methods that should be used to express the non-functional side of WS. This article presents an ontology of non-functional properties and shows, on the example of the WebSter registry, how it may be used within the WS discovery process in distributed environments.

Automatic Web Services Interactions--Requirements, Challenges and Limits from the F-WebS System Perspective

At the moment a lot is happening concerning the automatic interactions between and with Web services. In this article, we will elaborate shortly on the requirements and limits that need to be taken into account when dealing with semantic Web services. We base on our rich experience drawn from the creation and maintenance of F-WebS project. Additionally, several problems and challenges relating to the technology of semantic Web services are discussed

SDS-SOA 2009 Workshop Chairs’ Message

We are very pleased to present the proceedings of the First Workshop on Service Discovery and Selection in SOA Ecosystems (SDS-SOA 2009). The workshop was held on the premises and with support of Poznan University of Economics, Poznan, Poland, on the 29th April 2009. The workshop was organized in conjunction with 12th International Conference on Business Information Systems (BIS 2009).