Semantic Business Process Management: Applying Ontologies in BPM

Semantic Business Process Management: Applying Ontologies in BPM

Dimka Karastoyanova (University of Stuttgart, Germany), Tammo van Lessen (University of Stuttgart, Germany), Frank Leymann (University of Stuttgart, Germany), Zhilei Ma (University of Stuttgart, Germany), Joerg Nitzche (University of Stuttgart, Germany) and Branimir Wetzstein (University of Stuttgart, Germa)
Copyright: © 2009 |Pages: 19
DOI: 10.4018/978-1-60566-288-6.ch014
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Abstract

Even though process orientation/BPM is a widely accepted paradigm with heavy impact on industry and research the available technology does not support the business professionals’ tasks in an appropriate manner that is in a way allowing processes modeling using concepts from the business domain. This results in a gap between the business people expertise and the IT knowledge required. The current trend in bridging this gap is to utilize technologies developed for the Semantic Web, for example ontologies, while maintaining reusability and flexibility of processes. In this chapter the authors present an overview of existing technologies, supporting the BPM lifecycle, and focus on potential benefits Semantic Web technologies can bring to BPM. The authors will show how these technologies help automate the transition between the inherently separate/detached business professionals’ level and the IT level without the burden of additional knowledge acquisition on behalf of the business professionals. As background information they briefly discuss existing process modeling notations like the Business Process Modeling Notation (BPMN) as well as the execution centric Business Process Execution Language (BPEL), and their limitations in terms of proper support for the business professional. The chapter stresses on the added value Semantic Web technologies yield when leveraged for the benefit of BPM. For this the authors give examples of existing BPM techniques that can be improved by using Semantic Web technologies, as well as novel approaches which became possible only through the availability of semantic descriptions. They show how process model configuration can be automated and thus simplified and how flexibility during process execution is increased. Additionally, they present innovative techniques like automatic process composition and auto-completion of process models where suitable process fragments are automatically discovered to make up the process model. They also present a reference architecture of a BPM system that utilizes Semantic Web technologies in an SOA environment.
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Introduction

The goal of this chapter is to present how model transformation and refinement techniques can be applied to produce executable code out of business process models. The chapter shows how model-driven architecture (MDA) techniques have been applied with success to the domain of business process modeling. More in detail, once a business process has been modeled using some language, there are two main alternatives to be considered in order to run the process model using a workflow execution engine (Figure 1). The first involves the direct interpretation of the model, the second the compilation of the model into a lower-level representation amenable to more efficient execution.

Figure 1.

Interpreted (left) vs. compiled (right) process execution

As an example case study, the chapter shows how the idea of compiling business process models has been driving the design of the JOpera for Eclipse workflow management tool. JOpera presents users with a simple, graph-based process modeling language with a visual representation of both control and data-flow aspects. As an intermediate representation, the graphs are converted into Event-Condition-Action rules, which are further compiled into Java bytecode for execution.

These transformations have been fully implemented in the JOpera process compiler in a completely transparent way, where the generated Java executable artifacts are kept hidden from users at all times (i.e., even for debugging process executions, which is done using the original, high level notation). We evaluate our approach by discussing how using a compiler has opened up the several possibilities for performing optimization on the generated code and also simplified the design and positively impacted the quality of the corresponding workflow engine architecture.

This chapter introduces with an example a hierarchy of business process meta-models, leading from abstract, high level and graphical representations suitable for human consumption, down to lower-level languages geared towards efficient execution by a machine. Whereas for didactical purposes (and space limitations) the example presented in this chapter is focused on representations for modeling control-flow aspects, JOpera follows a similar approach with respect to the data flow and the resource perspective of the workflow models. We define relationships and transformations between the representations, in order to support the automatic refinement, optimization and compilation of models in one direction. We also present the abstraction operations required in the reverse direction in order to provide support for “source-level” monitoring and interactive debugging of the execution of business process models.

The rest of this chapter is structured as follows. A motivation for introducing process compilation (as opposed to interpretation and model refinement) is presented in the following Section. We then briefly enumerate in Section ‘Process Representations’ different abstraction levels and viewpoints that can be used to represent a process model that is meant to be compiled for execution using JOpera. In the following section, we show a concrete example of how a process model can be transformed between these representations. In the ‘Architecture’ Section, we present the design of the architecture of the JOpera workflow engine, emphasizing the role played by its compiler. Before drawing some conclusions, we evaluate the benefits and limitations of our approach in the ‘Discussion’ Section.

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Motivation

Workflow engines traditionally play the role of business process language interpreters. Why should a compiler be used instead of an interpreter? Direct interpretation of process descriptions is the typical approach of most workflow execution engines. In the simplest case, the model description as it is specified by the process modeler is directly fed into the workflow engine, which uses it to initialize the state of a new workflow instance (e.g., stored in a database) and navigate over (or analyze) the control flow dependencies between tasks to determine the partial order in which tasks should be executed. The advantage of this approach lies in the portability of the process models (which can be interpreted by engines running on different hardware/operating system/database platforms). As with most interpreted languages, however, the disadvantage lies in the higher runtime overhead of the execution and in the complexity of the runtime engine infrastructure featuring support for exception handling, late binding, and flexible, ad-hoc execution.

Key Terms in this Chapter

Service-Oriented Architecture (SOA): is the architectural style for service-oriented computing. By identifying agnostic, self-contained services that encapsulate high-level business concepts it achieves a high degree of reusability. The key concepts of an SOA are “service consumers”, “service providers” and a “service discovery” which enable loose coupling between components.

BPEL for Semantic Web Services (BPEL4SWS): is comprised of a set of specifications that in combination facilitate the orchestration of both, Web Services and semantic Web Services. It uses an extension of BPEL that provides for an interaction model that is independent of WSDL, semantic Web Service description frameworks like OWL-S and WSMO to specify the capabilities the process provides and the capabilities a process requires from its partners. Additionally it defines a grounding format to enable Web Service based communication with partner (semantic) Web Services.

Ontology: is one of the essential ingredients in the layered technologies of the Semantic Web. An ontology provides a vocabulary of consolidated concepts arranged in types and categories in well-defined structure for unambiguous use in a specific domain. An ontology in computer science is normally accompanied with a language, usually in an XML representation, for defining the vocabulary and specifying the relationships between the concepts in the vocabulary, e.g. Web Ontology Language (OWL), and Web Services Modeling Language (WSML).

Semantic Web Services (SWS): is an approach to combine (in particular WSDL-based) Web services with Semantic Web technologies (in particular ontologies), in order to achieve more automation in discovery, selection, and invocation of Web services. Web service interface descriptions are described semantically using ontologies, thus specifying their interface in a machine-readable manner. Popular SWS approaches are OWL-S, WSMO, and SA-WSDL.

The Semantic Service Bus (SSB): is the key integration middleware in semantically enabled SOAs. Similar to an Enterprise Service Bus (ESB) it provides a communication and virtualization platform for services. In addition it introduces platform services fostering the use of semantic web techniques for data mediation, data transformation, process composition, discovery and reasoning. It provides a physically distributed but logically united entry point for semantic web services and semantic business processes and employs deployment strategies for such components.

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Table of Contents
Preface
Jorge Cardoso, Wil van der Aalst
Chapter 1
Tiziana Margaria, Bernhard Steffen
The one thing approach is designed to overcome the classical communication hurdles between application experts and the various levels of IT experts.... Sample PDF
Business Process Modeling in the jABC: The One-Thing Approach
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Chapter 2
Huy Tran, Ta’id Holmes, Uwe Zdun, Schahram Dustdar
This chapter introduces a view-based, model-driven approach for process-driven, service-oriented architectures. A typical business process consists... Sample PDF
Modeling Process-Driven SOAs: A View-Based Approach
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Chapter 3
Stefan Jablonski
This chapter presents a process modeling approach for holistic process management. The main idea is that domain specific process models are required... Sample PDF
Process Modeling for Holistic Process Management
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Chapter 4
Matthias Kloppmann, Dieter Koenig, Simon Moser
This chapter introduces a set of languages intended to model and run business processes. The Business Process Modeling Notation 1.1 (BPMN) is a... Sample PDF
The Dichotomy of Modeling and Execution: BPMN and WS-BPEL
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Chapter 5
Chun Ouyang, Michael Adams, Arthur H.M. ter Hofstede
Due to the absence of commonly accepted conceptual and formal foundations for workflow management, and more generally Business Process Management... Sample PDF
Yet Another Workflow Language: Concepts, Tool Support, and Application
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Chapter 6
Modelling Constructs  (pages 122-141)
Ekkart Kindler
There are many different notations and formalisms for modelling business processes and workflows. These notations and formalisms have been... Sample PDF
Modelling Constructs
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Chapter 7
Kwanghoon Kim, Clarence A. Ellis
This chapter introduces the basic concepts of information control net (ICN) and its workflow models. In principle, a workflow model is the... Sample PDF
ICN-Based Workflow Model and its Advances
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Chapter 8
Manfred Reichert, Peter Dadam
In dynamic environments it must be possible to quickly implement new business processes, to enable ad-hoc deviations from the defined business... Sample PDF
Enabling Adaptive Process-Aware Information Systems with ADEPT2
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Chapter 9
Macello La Rosa, Marlon Dumas, Arthur H.M. ter Hofstede
A reference process model represents multiple variants of a common business process in an integrated and reusable manner. It is intended to be... Sample PDF
Modeling Business Process Variability for Design-Time Configuration
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Chapter 10
Cesare Pautasso
Model-driven architecture (MDA), design and transformation techniques can be applied with success to the domain of business process modeling (BPM)... Sample PDF
Compiling Business Process Models into Executable Code
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Chapter 11
Cinzia Cappiello, Barbara Pernici
This chapter illustrates the concept of repairable processes and self-healing functionalities and discusses about their design requirements.... Sample PDF
Design of Repairable Processes
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Chapter 12
Web Process Adaptation  (pages 245-253)
Kunal Verma
Adaptation is an important concept for Web processes. The author provides an overview of adaptation with respect to control theory and how it is... Sample PDF
Web Process Adaptation
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Chapter 13
Carlo Combi, Giuseppe Pozzi
Time is a very important dimension of any aspect in human life, affecting also information and information management. As such, time must be dealt... Sample PDF
Temporalities for Workflow Management Systems
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Chapter 14
Karsten Ploesser, Nick Russell
This chapter discusses the challenges associated with integrating work performed by human agents into automated workflows. It briefly recounts the... Sample PDF
The People Integration Challenge
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Chapter 15
Dimka Karastoyanova, Tammo van Lessen, Frank Leymann, Zhilei Ma, Joerg Nitzche, Branimir Wetzstein
Even though process orientation/BPM is a widely accepted paradigm with heavy impact on industry and research the available technology does not... Sample PDF
Semantic Business Process Management: Applying Ontologies in BPM
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Chapter 16
Hernani Mourao, Pedro Antunes
In this chapter the authors propose a solution to handle unexpected exceptions in WfMS. They characterize these events deeply and recognize that... Sample PDF
Using WfMS to Support Unstructured Activities
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Chapter 17
Guillermo Jimenez
In this chapter the authors introduce the role of a business process engineer (BPE) and necessary competencies to define, simulate, analyze, and... Sample PDF
Business Process Engineering
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Chapter 18
Christoph Bussler
This chapter introduces the application of process management to business-to-business (B2B) integration and enterprise application integration... Sample PDF
B2B and EAI with Business Process Management
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Chapter 19
Paul Grefen
This chapter is devoted to automated support for interorganizational business process management, that is, formation and enactment of business... Sample PDF
Systems for Interorganizational Business Process Management
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Chapter 20
Guido Governatori, Shazia Sadiq
It is a typical scenario that many organisations have their business processes specified independently of their business obligations (which includes... Sample PDF
The Journey to Business Process Compliance
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Chapter 21
M. Castellanos, A.K. Alves de Medeiros, J. Mendling, B. Weber, A.J.M.M. Weijters
Business Process Intelligence (BPI) is an emerging area that is getting increasingly popular for enterprises. The need to improve business process... Sample PDF
Business Process Intelligence
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Chapter 22
Diogo R. Ferreira
This chapter introduces the principles of sequence clustering and presents two case studies where the technique is used to discover behavioral... Sample PDF
Applied Sequence Clustering Techniques for Process Mining
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Chapter 23
Kamal Bhattacharya, Richard Hull, Jianwen Su
This chapter describes a design methodology for business processes and workflows that focuses first on “business artifacts”, which represent key... Sample PDF
A Data-Centric Design Methodology for Business Processes
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Chapter 24
Laura Sanchez, Andrea Delgado, Francisco Ruiz, Felix Garcia, Mario Piattini
The underlying premise of process management is that the quality of products and services is largely determined by the quality of the processes used... Sample PDF
Measurement and Maturity of Business Processes
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