Modeling QoS characteristics in WSMO

Abstract

Service oriented architectures (SOAs) are becoming widespread solutions for realizing distributed applications. They promote a service view of the world in which functionalities exposed as services by different companies are assembled and reused in a standardized manner. Services are the core building blocks of SOAs and therefore modeling various aspects of services becomes a fundamental challenge. Among these aspects, quality-of-service (QoS) need to be addressed given the high dynamism of any SOA-based system. This paper introduces the basic steps of modeling QoS characteristics of services with the Web Service Modeling Ontology (WSMO) in order to provide a QoS-aware SOA. It discusses the current limitations of modeling QoS characteristics with WSMO and proposes a set of approaches towards a richer QoS modeling support. Each approach is analyzed in terms of complexity and the advantages and disadvantages of each approach are discussed.

An MAS-Based Implementation for Semantic Web Services Composition

“…Goals are depictions of the expectations a service requestor may have when seeking for a service based on functionality, approach and quality of service. Mediators coordinate the heterogeneity problem that occurs between descriptions at different levels [16]: data level -different terminologies, protocol level -different communication behaviour between services, and process level -different business processes. WSMO defines four types of mediators: OO Mediators connect and mediate heterogeneous ontologies, GG Mediators connect Goals, WG Mediators link Web services to Goals, and WW Mediators connect Web services resolving mismatches between them.…”

Service Level Agreement Management in Federated Virtual Organizations

“…WSML/WSMO QoS extension [18]) and eContracting languages and systems extensions, such as Laura [19] extending ebXML.…”

Considering Quality of a Service in an Intentional Approach

“…The selection process supports several QoS models (Zeng et al, 2003;Herssens et al, 2008;Maximilien & Singh, 2004;Dobson et al, 2005;Toma et al, 2006;Ma et al, 2009) that enable providers and users to share the same concepts in the perspective of facilitating selection algorithm execution. Certain authors (Zeng et al, 2003;Herssens et al, 2008) consider the QoS as a collection of metrics related to non functional properties of services.…”

“…Zeng et al (2003) propose a QoS model to describe concepts of QoS such as execution price and execution duration, whereas Herssens et al (2008) recommend using the Unified Modeling Language (UML) to enable QoS modeling. Another authors (Maximilien & Singh, 2004;Dobson et al, 2005;Toma et al, 2006) propose an ontology to describe the quality concepts. Practically, Toma et al (2006) proposes extending the Web Service Modeling Ontology (WSMO) with QoS support by modeling QoS as quality attributes.…”

“…Another authors (Maximilien & Singh, 2004;Dobson et al, 2005;Toma et al, 2006) propose an ontology to describe the quality concepts. Practically, Toma et al (2006) proposes extending the Web Service Modeling Ontology (WSMO) with QoS support by modeling QoS as quality attributes.…”