Volume

Dagstuhl Seminar Proceedings, Volume 6291

Publication Details

  • published at: 2006-11-24
  • Publisher: Schloss Dagstuhl – Leibniz-Zentrum für Informatik

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Document
DOI: 10.4230/DagSemProc.06291.1
06291 Abstracts Collection – The Role of Business Processes in Service-Oriented Architectures

Authors: Frank Leymann, Wolfgang Reisig, Satish R. Thatte, and Wil van der Aalst

Abstract
The Dagstuhl seminar on \emph{The Role of Business Processes in Service Oriented Architectures} (Seminar 06291) took place in July 2006 (16.07.2006-21.07.2006 to be precise). The seminar was attended by more than 40 experts from both academia and industry. Unlike most Dagstuhl seminars there was a high participation from industry (in particular from organizations developing software, e.g., IBM, SAP, Microsoft, Google, etc.). The focal point of the seminar was the marriage of business processes and service oriented architectures. This was reflected by the topics selected by the participants and their background.
Cite as

Frank Leymann, Wolfgang Reisig, Satish R. Thatte, and Wil van der Aalst. 06291 Abstracts Collection – The Role of Business Processes in Service-Oriented Architectures. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{leymann_et_al:DagSemProc.06291.1,
  author =	{Leymann, Frank and Reisig, Wolfgang and Thatte, Satish R. and van der Aalst, Wil},
  title =	{{06291 Abstracts Collection – The Role of Business Processes in Service-Oriented Architectures}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--28},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.1},
  URN =		{urn:nbn:de:0030-drops-8324},
  doi =		{10.4230/DagSemProc.06291.1},
  annote =	{Keywords: Business Process Management, Workflow Management, Middleware, Service Oriented Architecture, Web Services, Petri-Nets, Transaction Models, Mega-Programming}
}
Document
DOI: 10.4230/DagSemProc.06291.2
06291 Workshop Report: Conversation Patterns

Authors: Gregor Hohpe

Abstract
In a service-oriented architecture systems communicate by exchanging messages. Message passing provides for robust and loosely coupled interaction but it also provides less structure than traditional RPC models, which are based on a fairly rigid request-response interaction style. Instead, messages exchanged over time between a set of parties can form a multitude of conversations. An expressive contract between communicating parties should define a coordination protocol that describes which conversations are legal. Such a protocol can be expressed in different ways, for example through choreography or public endpoint process definitions. The purpose of conversations patterns is to document common forms of conversations in the design pattern format, highlighting design trade-offs and popular implementations. As part of the Dagstuhl Seminar 06291 on The Role of Business Processes in Service Oriented Architectures in July 2006 we held a Workshop on Conversation Patterns. In this paper, we report on the results of this workshop.
Cite as

Gregor Hohpe. 06291 Workshop Report: Conversation Patterns. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{hohpe:DagSemProc.06291.2,
  author =	{Hohpe, Gregor},
  title =	{{06291 Workshop Report:  Conversation Patterns}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--7},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.2},
  URN =		{urn:nbn:de:0030-drops-8288},
  doi =		{10.4230/DagSemProc.06291.2},
  annote =	{Keywords: Patterns, Conversation, Orchestration, Choreography}
}
Document
DOI: 10.4230/DagSemProc.06291.3
06291 Workshop Report: Process Mining, Monitoring Processes and Services

Authors: Wil van der Aalst

Abstract
In a service-oriented architecture, but also in classical entreprise systems, a variety of events (e.g., messages being sent and received) are being logged. This information can be used for process mining purposes, i.e., based on some event log it is possible to discover processes or to check conformance. The goal of process discovery is to build models without a-priori knowledge, i.e., based on sequences of events one can look for the presence or absence of certain patterns and deduce some process model from it. For conformance checking there has to be an initial model. One can think of this model as a contract" or speci¯cation" and it is interesting to see whether the parties involved stick to this model. Using conformance checking it is possible to quantify the fit (fewer deviations result in a better fit) and to locate problem areas" where a lot of deviations take place. One of the four workshops organized within the context of the Dagstuhl seminar on The Role of Business Processes in Service Oriented Architec- tures (Seminar 06291, 16.07.2006-21.07.2006) was aWorkshop on Process Mining and Monitoring Processes and Services. In this paper, we report on the results of the workshop.
Cite as

Wil van der Aalst. 06291 Workshop Report: Process Mining, Monitoring Processes and Services. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{vanderaalst:DagSemProc.06291.3,
  author =	{van der Aalst, Wil},
  title =	{{06291 Workshop Report: Process Mining, Monitoring Processes and Services}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--7},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.3},
  URN =		{urn:nbn:de:0030-drops-8345},
  doi =		{10.4230/DagSemProc.06291.3},
  annote =	{Keywords: }
}
Document
DOI: 10.4230/DagSemProc.06291.4
A SOA-Based Architecture Framework

Authors: Wil van der Aalst, Michael Beisiegel, Kees van Hee, Dieter König, and Christian Stahl

Abstract
In this paper we present first results of a SOA-based architecture framework. The architecture framework is required to be close to industry standards, especially to service component architecture (SCA), language independent (i.e. it is adoptable) and the building blocks of a system, activities and data, are first class citizens. We present a meta model of the architecture framework and discuss its concepts in detail.
Cite as

Wil van der Aalst, Michael Beisiegel, Kees van Hee, Dieter König, and Christian Stahl. A SOA-Based Architecture Framework. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{vanderaalst_et_al:DagSemProc.06291.4,
  author =	{van der Aalst, Wil and Beisiegel, Michael and van Hee, Kees and K\"{o}nig, Dieter and Stahl, Christian},
  title =	{{A SOA-Based Architecture Framework}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--17},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.4},
  URN =		{urn:nbn:de:0030-drops-8277},
  doi =		{10.4230/DagSemProc.06291.4},
  annote =	{Keywords: SOA, architecture framework}
}
Document
DOI: 10.4230/DagSemProc.06291.5
AMFIBIA: A Meta-Model for the Integration of Business Process Modelling Aspects

Authors: Ekkart Kindler, Björn Axenath, and Vladimir Rubin

Abstract
Today, there are many different formalisms and notations for modelling business processes. Though most of the formalisms have their justification, the plethora of notations makes it hard to compare and to exchange business process models among different tools. AMFIBIA (A Meta-model For the Integration of BusIness process modelling Aspects) sets out to capture the basic aspects of business process models and to define their concepts independently from a particular formalism and notation, and then map different formalisms to these basic concepts. This way, business process models can be compared with each other, and it will be even possible, to integrate and combine different formalisms in a single workflow engine. Currently, we implement a prototype of a workflow engine, which supports the concepts of AMFIBIA. Since the development of AMFIBIA started quite late in the history of workflow management, it might not have strong impact on existing workflow management systems. The concepts of AMFIBIA, however, should be applicable to SOA, were formalism independence is even more important. The talk presents the ideas and concepts of AMFIBIA and intends to trigger a discussion on the aspects of SOA and the aspects and concepts that need to me captured in SOA.
Cite as

Ekkart Kindler, Björn Axenath, and Vladimir Rubin. AMFIBIA: A Meta-Model for the Integration of Business Process Modelling Aspects. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{kindler_et_al:DagSemProc.06291.5,
  author =	{Kindler, Ekkart and Axenath, Bj\"{o}rn and Rubin, Vladimir},
  title =	{{AMFIBIA: A Meta-Model for the Integration of Business Process Modelling Aspects}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--26},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.5},
  URN =		{urn:nbn:de:0030-drops-8231},
  doi =		{10.4230/DagSemProc.06291.5},
  annote =	{Keywords: Aspect oriented modelling, Formalism independence, BPM}
}
Document
DOI: 10.4230/DagSemProc.06291.6
An Algorithm for Matching Nondeterministic Services with Operating Guidelines

Authors: Peter Massuthe and Karsten Wolf

Abstract
Interorganizational cooperation is more and more organized by the paradigm of services. Service-oriented architectures (SOA) provide a general framework for service interaction. SOA describe three roles of services, the service provider, the service requester, and the service broker, together with the three operations publish, find, and bind. We provide a formal method based on nondeterministic automata to model services and their interaction. In this paper, we restrict ourselves to finite and acyclic automata. We suggest operating guidelines as a convenient and intuitive artifact to realize the publish operation. In our approach, the find operation reduces to a matching problem between the requester's service and the published operating guidelines. If matching services are actually bound together, our approach guarantees deadlock-free communication. In this paper, matching of deterministic as well as nondeterministic automata with operating guidelines is presented.
Cite as

Peter Massuthe and Karsten Wolf. An Algorithm for Matching Nondeterministic Services with Operating Guidelines. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{massuthe_et_al:DagSemProc.06291.6,
  author =	{Massuthe, Peter and Wolf, Karsten},
  title =	{{An Algorithm for Matching Nondeterministic Services with Operating Guidelines}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--19},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.6},
  URN =		{urn:nbn:de:0030-drops-8247},
  doi =		{10.4230/DagSemProc.06291.6},
  annote =	{Keywords: Services, SOA, Formal Methods, (Nondeterministic) Automata, Operating guidelines, Matching}
}
Document
DOI: 10.4230/DagSemProc.06291.7
Approaches to Compute Workflow Complexity

Authors: Jorge Cardoso

Abstract
During the last 20 years, complexity has been an interesting topic that has been investigated in many fields of science, such as biology, neurology, software engineering, chemistry, psychology, and economy. A survey of the various approaches to understand complexity has lead sometimes to a measurable quantity with a rigorous but narrow definition and other times as merely an ad hoc label. In this paper we investigate the complexity concept to avoid a vague use of the term `complexity' in workflow designs. We present several complexity metrics that have been used for a number of years in adjacent fields of science and explain how they can be adapted and use to evaluate the complexity of workflows.
Cite as

Jorge Cardoso. Approaches to Compute Workflow Complexity. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{cardoso:DagSemProc.06291.7,
  author =	{Cardoso, Jorge},
  title =	{{Approaches to Compute Workflow Complexity}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--15},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.7},
  URN =		{urn:nbn:de:0030-drops-8219},
  doi =		{10.4230/DagSemProc.06291.7},
  annote =	{Keywords: Workflow, Complexity, Business Processes, Reengineering}
}
Document
DOI: 10.4230/DagSemProc.06291.8
Aspect-Oriented Techniques for Web Services: a Model-Driven Approach

Authors: Guadalupe Ortiz and Juan Hernández

Abstract
Web Service technologies offer a successful way for interoperability among applications, but in order to tackle the entire web service life cycle, it is necessary to face how to model systems based on service functionality and also how to add extra-functional properties to modelled services. In this regard, we propose first of all a versatile and simple UML profile based on the Service Component Architecture specification for modelling services, in order to provide a model environment in which to add extra-functional properties. Secondly, a new UML profile is proposed to model and reuse the said extra-functional properties in service models. The implemented models based on these profiles will be independent from a final implementation language or platform, thus it is necessary to specify a particular type of model to convert the independent one into in a subsequent step. In order to meet this requirement an object, an aspect and a policy based models are proposed as the intermediate step between the independent model and the final code. We acknowledge that there are tools available which convert Java models into web services' Java code, and it is not our aim to build a tool to fulfil this requirement. Regarding extra-functional properties, aspect-oriented techniques allow them to be easily modularized and reused; in this respect, properties are implemented as aspects in a totally transparent way and avoid the need to modify service code in an intrusive manner on adding extra-functional properties, improving our system maintenance. Furthermore, this way traceability between the model and the code is perfectly maintained in both directions. This work has been developed thanks to the support of CICYT under contract TIN2005-09405-C02-02.
Cite as

Guadalupe Ortiz and Juan Hernández. Aspect-Oriented Techniques for Web Services: a Model-Driven Approach. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{ortiz_et_al:DagSemProc.06291.8,
  author =	{Ortiz, Guadalupe and Hern\'{a}ndez, Juan},
  title =	{{Aspect-Oriented Techniques for Web Services: a Model-Driven Approach}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--14},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.8},
  URN =		{urn:nbn:de:0030-drops-8269},
  doi =		{10.4230/DagSemProc.06291.8},
  annote =	{Keywords: Web Service, Model Driven Development, Aspect-Oriented Techniques, Extra-Functional Property, Service Component Architecture, Ws-Policy}
}
Document
DOI: 10.4230/DagSemProc.06291.9
Choreography Conformance Checking: An Approach based on BPEL and Petri Nets

Authors: Wil van der Aalst, Marlon Dumas, C. Ouyang, Anne Rozinat, and H. M. W. Verbeek

Abstract
Recently, languages such as BPEL and WS-CDL have been proposed to describe interactions between services and their behavioral dependencies. The emergence of these languages heralds an era where richer service descriptions, going beyond WSDL-like interfaces, will be available. However, what can these richer service descriptions serve for? This talk discussed the use of event logs of web services and behavioral service descriptions as input for process mining and conformance checking. Conformance checking is the act of verifying whether or not one or more parties stick to an agreed-upon behavior, by observing their actual behavior as recorded in message logs. This talk shows that it is possible to translate BPEL business abstract processes to Petri nets and to relate SOAP messages to transitions in the Petri net. The approach has been implemented in the ProM framework.
Cite as

Wil van der Aalst, Marlon Dumas, C. Ouyang, Anne Rozinat, and H. M. W. Verbeek. Choreography Conformance Checking: An Approach based on BPEL and Petri Nets. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-71, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{vanderaalst_et_al:DagSemProc.06291.9,
  author =	{van der Aalst, Wil and Dumas, Marlon and Ouyang, C. and Rozinat, Anne and Verbeek, H. M. W.},
  title =	{{Choreography Conformance Checking: An Approach based on BPEL and Petri Nets}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--71},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.9},
  URN =		{urn:nbn:de:0030-drops-8307},
  doi =		{10.4230/DagSemProc.06291.9},
  annote =	{Keywords: Process mining, SOAP messages, BPEL, Petri nets}
}
Document
DOI: 10.4230/DagSemProc.06291.10
DecSerFlow: Towards a Truly Declarative Service Flow Language

Authors: Wil van der Aalst and Maja Pesic

Abstract
The need for process support in the context of web services has triggered the development of many languages, systems, and standards. Industry has been developing software solutions and proposing standards such as BPEL, while researchers have been advocating the use of formal methods such as Petri nets and pi-calculus. The languages developed for service flows, i.e., process specification languages for web services, have adopted many concepts from classical workflow management systems. As a result, these languages are rather procedural and this does not fit well with the autonomous nature of services. Therefore, we propose DecSerFlow as a Declarative Service Flow Language. DecSerFlow can be used to specify, enact, and monitor service flows. The language is extendible (i.e., constructs can be added without changing the engine or semantical basis) and can be used to enforce or to check the conformance of service flows. Although the language has an appealing graphical representation, it is grounded in temporal logic.
Cite as

Wil van der Aalst and Maja Pesic. DecSerFlow: Towards a Truly Declarative Service Flow Language. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{vanderaalst_et_al:DagSemProc.06291.10,
  author =	{van der Aalst, Wil and Pesic, Maja},
  title =	{{DecSerFlow: Towards a Truly Declarative Service Flow Language}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--23},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.10},
  URN =		{urn:nbn:de:0030-drops-8298},
  doi =		{10.4230/DagSemProc.06291.10},
  annote =	{Keywords: DecSerFlow, LTL, service flows, web services, SOA}
}
Document
DOI: 10.4230/DagSemProc.06291.11
Model-Driven and Pattern-Based Integration of Process-Driven SOA Models

Authors: Uwe Zdun and Schahram Dustdar

Abstract
Service-oriented architectures (SOA) are increasingly used in the context of business processes. However, the modeling approaches for process-driven SOAs do not yet sufficiently integrate the various kinds of models relevant for a process-driven SOA – ranging from process models to software architectural models to software design models. We propose to integrate process-driven SOA models via a model-driven software development approach that is based on proven practices documented as software patterns. We introduce pattern primitives as an intermediate abstraction to formally model the participants in the solutions that patterns convey. To enable model-driven development, we develop domain-specific modeling languages for each kind of process-driven SOA model - based on formal meta-models that are extended with the pattern primitives. The various process-driven SOA models are integrated in a model-driven tool chain via the meta-models. Our tool chain validates the process-driven SOA models with regard to the constraints given by the meta-models and primitives.
Cite as

Uwe Zdun and Schahram Dustdar. Model-Driven and Pattern-Based Integration of Process-Driven SOA Models. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-32, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{zdun_et_al:DagSemProc.06291.11,
  author =	{Zdun, Uwe and Dustdar, Schahram},
  title =	{{Model-Driven and Pattern-Based  Integration of Process-Driven SOA Models}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--32},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.11},
  URN =		{urn:nbn:de:0030-drops-8205},
  doi =		{10.4230/DagSemProc.06291.11},
  annote =	{Keywords: Process-Driven SOA, Pattern, Pattern Primitives}
}
Document
DOI: 10.4230/DagSemProc.06291.12
Pricing Web Services

Authors: Oliver Günther, Gerrit Tamm, and Frank Leymann

Abstract
This paper focuses on the challenges associated with composing and pricing web services. We present the results of an online experiment, where subjects were confronted with a variety of choices and decisions relating to web service markets and service composition. Our analysis shows that people expect the price of a composite web service to be lower than the sum of the prices of the elementary services, i.e., users are not willing to pay for aggregation by a third party. To obtain a viable business model for composed web services, non-standard pricing mechanisms, such as auctions and negotiations, possibly supported by electronic agents, have to be taken into consideration. Usage-based pricing schemes, combined with an option to switch to a flat subscription, seem most appropriate to penetrate the developing web service market.
Cite as

Oliver Günther, Gerrit Tamm, and Frank Leymann. Pricing Web Services. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{gunther_et_al:DagSemProc.06291.12,
  author =	{G\"{u}nther, Oliver and Tamm, Gerrit and Leymann, Frank},
  title =	{{Pricing Web Services}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--13},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.12},
  URN =		{urn:nbn:de:0030-drops-8220},
  doi =		{10.4230/DagSemProc.06291.12},
  annote =	{Keywords: Composite web services, pricing}
}
Document
DOI: 10.4230/DagSemProc.06291.13
Towards a Services-Based Process Platform

Authors: Dominik Kuropka and Mathias Weske

Abstract
Service oriented software architectures that are aware of business processes will form the core of operational IT landscapes in the future. This contribution starts with an introduction of the state of the art in service oriented architectures. A concrete case study identifies central requirements that are not satisfied by these architectures so far. The authors argue that semantically rich descriptions of services are essential to tap the full potential of service oriented architectures in enterprise environments. This regards matchmaking and binding of services, integration of new services as well as the cost-efficient development of added value services by composing semantically described basic services. This paper introduces a semantic service platform that implements dynamic matchmaking, composition and binding of semantically described services. Finally its functionality and possible application scenarios are outlined.
Cite as

Dominik Kuropka and Mathias Weske. Towards a Services-Based Process Platform. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{kuropka_et_al:DagSemProc.06291.13,
  author =	{Kuropka, Dominik and Weske, Mathias},
  title =	{{Towards a Services-Based Process Platform}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--23},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.13},
  URN =		{urn:nbn:de:0030-drops-8310},
  doi =		{10.4230/DagSemProc.06291.13},
  annote =	{Keywords: Business process platform, Semantic Services, Service-oriented architectures}
}
Document
DOI: 10.4230/DagSemProc.06291.14
Towards UML Modelling Extra-Functional Properties in Web Services and their Clients

Authors: Guadalupe Ortiz and Juan Hernández

Abstract
Web Services provide our systems with a platform independent and loosely coupled implementation environment, being time to face how the named systems can be modelled. Service Component Architecture (SCA) allows us to define services independently of the final implementation technology; however, it does not integrate the remaining development stages. Model Driven Architecture provides a method to face all stages in development from the platform independent model to final code, although it is not specific to service technologies. Regarding web service extra-functional properties, WS-Policy establishes how to describe them in a loosely coupled manner; however the loosely coupled environment is not always maintained when modelling or implementing these properties, which can be solved by using aspect-oriented techniques. In this paper, we propose to use a model driven approach for extra-functional properties in SCA service based models, where generated code will consist of the policy description and an aspect-oriented implementation.
Cite as

Guadalupe Ortiz and Juan Hernández. Towards UML Modelling Extra-Functional Properties in Web Services and their Clients. In The Role of Business Processes in Service Oriented Architectures. Dagstuhl Seminar Proceedings, Volume 6291, pp. 1-16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{ortiz_et_al:DagSemProc.06291.14,
  author =	{Ortiz, Guadalupe and Hern\'{a}ndez, Juan},
  title =	{{Towards UML Modelling Extra-Functional Properties in Web Services and their Clients}},
  booktitle =	{The Role of Business Processes in Service Oriented Architectures},
  pages =	{1--16},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{6291},
  editor =	{Frank Leymann and Wolfgang Reisig and Satish R. Thatte and Wil van der Aalst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06291.14},
  URN =		{urn:nbn:de:0030-drops-8251},
  doi =		{10.4230/DagSemProc.06291.14},
  annote =	{Keywords: Extra-Functional property, web service, UML modeling, aspect-oriented techniques, WS-policy, service component architecture}
}

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