@unpublished{KroeningMargariaWoodcock2011, author = {Kr{\"o}ning, Daniel and Margaria, Tiziana and Woodcock, Jim}, title = {Untitled}, series = {Formal aspects of computing : the international journal of formal methods}, volume = {23}, journal = {Formal aspects of computing : the international journal of formal methods}, number = {5}, publisher = {Springer}, address = {New York}, issn = {0934-5043}, doi = {10.1007/s00165-011-0201-8}, pages = {585 -- 588}, year = {2011}, language = {en} } @book{AbrahamssonBaddooMargariaetal.2007, author = {Abrahamsson, Pekka and Baddoo, Nathan and Margaria, Tiziana and Messnarz, Richard}, title = {Software Process Improvement : 14th europea conference, EuroSpi 2007, Potsdam, Germany, September 26-28, 2007 ; Proceedings}, series = {Lecture Notes in Computer Science}, volume = {4764}, journal = {Lecture Notes in Computer Science}, publisher = {Springer}, address = {Berlin}, pages = {223 S.}, year = {2007}, language = {en} } @article{NaujokatNeubauerLamprechtetal.2014, author = {Naujokat, Stefan and Neubauer, Johannes and Lamprecht, Anna-Lena and Steffen, Bernhard and Joerges, Sven and Margaria, Tiziana}, title = {Simplicity-first model-based plug-in development}, series = {Software : practice \& experience}, volume = {44}, journal = {Software : practice \& experience}, number = {3}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {0038-0644}, doi = {10.1002/spe.2243}, pages = {277 -- 297}, year = {2014}, abstract = {In this article, we present our experience with over a decade of strict simplicity orientation in the development and evolution of plug-ins. The point of our approach is to enable our graphical modeling framework jABC to capture plug-in development in a domain-specific setting. The typically quite tedious and technical plug-in development is shifted this way from a programming task to the modeling level, where it can be mastered also by application experts without programming expertise. We show how the classical plug-in development profits from a systematic domain-specific API design and how the level of abstraction achieved this way can be further enhanced by defining adequate building blocks for high-level plug-in modeling. As the resulting plug-in models can be compiled and deployed automatically, our approach decomposes plug-in development into three phases where only the realization phase requires plug-in-specific effort. By using our modeling framework jABC, this effort boils down to graphical, tool-supported process modeling. Furthermore, we support the automatic completion of process sketches for executability. All this will be illustrated along the most recent plug-in-based evolution of the jABC framework, which witnessed quite some bootstrapping effects.}, language = {en} } @unpublished{MargariaHinchey2013, author = {Margaria, Tiziana and Hinchey, Mike}, title = {Simplicity in IT - the power of less}, series = {Computer : innovative technology for computer professionals}, volume = {46}, journal = {Computer : innovative technology for computer professionals}, number = {11}, publisher = {Inst. of Electr. and Electronics Engineers}, address = {Los Alamitos}, issn = {0018-9162}, doi = {10.1109/MC.2013.397}, pages = {23 -- 25}, year = {2013}, abstract = {Simplicity is a mindset, a way of looking at solutions, an extremely wide-ranging philosophical stance on the world, and thus a deeply rooted cultural paradigm. The culture of "less" can be profoundly disruptive, cutting out existing "standard" elements from products and business models, thereby revolutionizing entire markets.}, language = {en} } @article{BlumBoldeaMagedanzetal.2010, author = {Blum, Niklas and Boldea, Irina and Magedanz, Thomas and Margaria, Tiziana}, title = {Service-oriented access to next generation networks : from service creation to execution}, issn = {1383-469X}, doi = {10.1007/s11036-010-0222-1}, year = {2010}, abstract = {Existing telecommunication networks and classical roles of operators are subject to fundamental change. Many network operators are currently seeking for new sources to generate revenue by exposing network capabilities to 3rd party service providers. At the same time we can observe that services on the World Wide Web (WWW) are becoming mature in terms of the definition of APIs that are offered towards other services. The combinations of those services are commonly referred to as Web 2.0 mash-ups. Rapid service design and creation becomes therefore important to meet the requirements in a changing technology and competitive market environment. This report describes our approach to include Next Generation Networks (NGN)-based telecommunications application enabler into complex services by defining a service broker that mediates between 3rd party applications and NGN service enablers. It provides policy-driven orchestration mechanisms for service enablers, a service authorization functionality, and a service discovery interface for Service Creation Environments. The work has been implemented as part of the Open SOA Telco Playground testbed at Fraunhofer FOKUS.}, language = {en} } @misc{LamprechtNaujokatMargariaetal.2011, author = {Lamprecht, Anna-Lena and Naujokat, Stefan and Margaria, Tiziana and Steffen, Bernhard}, title = {Semantics-based composition of EMBOSS services}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {956}, issn = {1866-8372}, doi = {10.25932/publishup-43183}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-431830}, pages = {23}, year = {2011}, abstract = {Background More than in other domains the heterogeneous services world in bioinformatics demands for a methodology to classify and relate resources in a both human and machine accessible manner. The Semantic Web, which is meant to address exactly this challenge, is currently one of the most ambitious projects in computer science. Collective efforts within the community have already led to a basis of standards for semantic service descriptions and meta-information. In combination with process synthesis and planning methods, such knowledge about types and services can facilitate the automatic composition of workflows for particular research questions. Results In this study we apply the synthesis methodology that is available in the Bio-jETI workflow management framework for the semantics-based composition of EMBOSS services. EMBOSS (European Molecular Biology Open Software Suite) is a collection of 350 tools (March 2010) for various sequence analysis tasks, and thus a rich source of services and types that imply comprehensive domain models for planning and synthesis approaches. We use and compare two different setups of our EMBOSS synthesis domain: 1) a manually defined domain setup where an intuitive, high-level, semantically meaningful nomenclature is applied to describe the input/output behavior of the single EMBOSS tools and their classifications, and 2) a domain setup where this information has been automatically derived from the EMBOSS Ajax Command Definition (ACD) files and the EMBRACE Data and Methods ontology (EDAM). Our experiments demonstrate that these domain models in combination with our synthesis methodology greatly simplify working with the large, heterogeneous, and hence manually intractable EMBOSS collection. However, they also show that with the information that can be derived from the (current) ACD files and EDAM ontology alone, some essential connections between services can not be recognized. Conclusions Our results show that adequate domain modeling requires to incorporate as much domain knowledge as possible, far beyond the mere technical aspects of the different types and services. Finding or defining semantically appropriate service and type descriptions is a difficult task, but the bioinformatics community appears to be on the right track towards a Life Science Semantic Web, which will eventually allow automatic service composition methods to unfold their full potential.}, language = {en} } @article{LamprechtMargaria2014, author = {Lamprecht, Anna-Lena and Margaria, Tiziana}, title = {Scientific Workflows and XMDD}, series = {Process Design for Natural Scientists: an agile model-driven approach}, journal = {Process Design for Natural Scientists: an agile model-driven approach}, number = {500}, editor = {Lambrecht, Anna-Lena and Margaria, Tiziana}, publisher = {Springer Verlag}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {1 -- 13}, year = {2014}, abstract = {A major part of the scientific experiments that are carried out today requires thorough computational support. While database and algorithm providers face the problem of bundling resources to create and sustain powerful computation nodes, the users have to deal with combining sets of (remote) services into specific data analysis and transformation processes. Today's attention to "big data" amplifies the issues of size, heterogeneity, and process-level diversity/integration. In the last decade, especially workflow-based approaches to deal with these processes have enjoyed great popularity. This book concerns a particularly agile and model-driven approach to manage scientific workflows that is based on the XMDD paradigm. In this chapter we explain the scope and purpose of the book, briefly describe the concepts and technologies of the XMDD paradigm, explain the principal differences to related approaches, and outline the structure of the book.}, language = {en} } @article{LamprechtMargaria2015, author = {Lamprecht, Anna-Lena and Margaria, Tiziana}, title = {Scientific workflows and XMDD}, series = {Process design for natural scientists}, journal = {Process design for natural scientists}, editor = {Lamprecht, Anna-Lena and Margaria, Tiziana}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-662-45006-2}, pages = {1 -- 13}, year = {2015}, language = {en} } @book{Margaria2007, author = {Margaria, Tiziana}, title = {Proceedings / EuroSPI 2007, European Software Process Improvement, 26.-28.09.2007, University of Potsdam, Germany}, editor = {Messnarz, Richard}, publisher = {ASQF}, address = {Erlangen}, isbn = {978-3-9809145-6-7}, pages = {Getr. Z{\"a}hl.}, year = {2007}, language = {en} } @article{LamprechtMargariaSteffen2014, author = {Lamprecht, Anna-Lena and Margaria, Tiziana and Steffen, Bernhard}, title = {Modeling and Execution of Scientific Workflows with the jABC Framework}, series = {Process Design for Natural Scientists: an agile model-driven approach}, journal = {Process Design for Natural Scientists: an agile model-driven approach}, number = {500}, editor = {Lambrecht, Anna-Lena and Margaria, Tiziana}, publisher = {Springer Verlag}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {14 -- 29}, year = {2014}, abstract = {We summarize here the main characteristics and features of the jABC framework, used in the case studies as a graphical tool for modeling scientific processes and workflows. As a comprehensive environment for service-oriented modeling and design according to the XMDD (eXtreme Model-Driven Design) paradigm, the jABC offers much more than the pure modeling capability. Associated technologies and plugins provide in fact means for a rich variety of supporting functionality, such as remote service integration, taxonomical service classification, model execution, model verification, model synthesis, and model compilation. We describe here in short both the essential jABC features and the service integration philosophy followed in the environment. In our work over the last years we have seen that this kind of service definition and provisioning platform has the potential to become a core technology in interdisciplinary service orchestration and technology transfer: Domain experts, like scientists not specially trained in computer science, directly define complex service orchestrations as process models and use efficient and complex domain-specific tools in a simple and intuitive way.}, language = {en} } @article{LamprechtWickertMargaria2014, author = {Lamprecht, Anna-Lena and Wickert, Alexander and Margaria, Tiziana}, title = {Lessons Learned}, series = {Process Design for Natural Scientists: an agile model-driven approach}, journal = {Process Design for Natural Scientists: an agile model-driven approach}, number = {500}, editor = {Lambrecht, Anna-Lena and Margaria, Tiziana}, publisher = {Springer Verlag}, address = {Berlin}, isbn = {978-3-662-45005-5}, issn = {1865-0929}, pages = {45 -- 64}, year = {2014}, abstract = {This chapter summarizes the experience and the lessons we learned concerning the application of the jABC as a framework for design and execution of scientific workflows. It reports experiences from the domain modeling (especially service integration) and workflow design phases and evaluates the resulting models statistically with respect to the SIB library and hierarchy levels.}, language = {en} } @misc{LamprechtMargariaSteffenetal.2008, author = {Lamprecht, Anna-Lena and Margaria, Tiziana and Steffen, Bernhard and Sczyrba, Alexander and Hartmeier, Sven and Giegerich, Robert}, title = {GeneFisher-P}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {868}, issn = {1866-8372}, doi = {10.25932/publishup-43424}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-434241}, pages = {17}, year = {2008}, abstract = {Background: PCR primer design is an everyday, but not trivial task requiring state-of-the-art software. We describe the popular tool GeneFisher and explain its recent restructuring using workflow techniques. We apply a service-oriented approach to model and implement GeneFisher-P, a process-based version of the GeneFisher web application, as a part of the Bio-jETI platform for service modeling and execution. We show how to introduce a flexible process layer to meet the growing demand for improved user-friendliness and flexibility. Results: Within Bio-jETI, we model the process using the jABC framework, a mature model-driven, service-oriented process definition platform. We encapsulate remote legacy tools and integrate web services using jETI, an extension of the jABC for seamless integration of remote resources as basic services, ready to be used in the process. Some of the basic services used by GeneFisher are in fact already provided as individual web services at BiBiServ and can be directly accessed. Others are legacy programs, and are made available to Bio-jETI via the jETI technology. The full power of service-based process orientation is required when more bioinformatics tools, available as web services or via jETI, lead to easy extensions or variations of the basic process. This concerns for instance variations of data retrieval or alignment tools as provided by the European Bioinformatics Institute (EBI). Conclusions: The resulting service-and process-oriented GeneFisher-P demonstrates how basic services from heterogeneous sources can be easily orchestrated in the Bio-jETI platform and lead to a flexible family of specialized processes tailored to specific tasks.}, language = {en} } @article{BakeraMargariaRenneretal.2011, author = {Bakera, Marco and Margaria, Tiziana and Renner, Clemens D. and Steffen, Bernhard}, title = {Game-Based model checking for reliable autonomy in space}, series = {Journal of aerospace computing, information, and communication}, volume = {8}, journal = {Journal of aerospace computing, information, and communication}, number = {4}, publisher = {American Institute of Aeronautics and Astronautics}, address = {Reston}, issn = {1940-3151}, doi = {10.2514/1.32013}, pages = {100 -- 114}, year = {2011}, abstract = {Autonomy is an emerging paradigm for the design and implementation of managed services and systems. Self-managed aspects frequently concern the communication of systems with their environment. Self-management subsystems are critical, they should thus be designed and implemented as high-assurance components. Here, we propose to use GEAR, a game-based model checker for the full modal mu-calculus, and derived, more user-oriented logics, as a user friendly tool that can offer automatic proofs of critical properties of such systems. Designers and engineers can interactively investigate automatically generated winning strategies resulting from the games, this way exploring the connection between the property, the system, and the proof. The benefits of the approach are illustrated on a case study that concerns the ExoMars Rover.}, language = {en} } @misc{MargariaSteffenKubczak2010, author = {Margaria, Tiziana and Steffen, Bernhard and Kubczak, Christian}, title = {Evolution support in heterogeneous service-oriented landscapes}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {918}, issn = {1866-8372}, doi = {10.25932/publishup-43240}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-432405}, pages = {15}, year = {2010}, abstract = {We present an approach that provides automatic or semi-automatic support for evolution and change management in heterogeneous legacy landscapes where (1) legacy heterogeneous, possibly distributed platforms are integrated in a service oriented fashion, (2) the coordination of functionality is provided at the service level, through orchestration, (3) compliance and correctness are provided through policies and business rules, (4) evolution and correctness-by-design are supported by the eXtreme Model Driven Development paradigm (XMDD) offered by the jABC (Margaria and Steffen in Annu. Rev. Commun. 57, 2004)—the model-driven service oriented development platform we use here for integration, design, evolution, and governance. The artifacts are here semantically enriched, so that automatic synthesis plugins can field the vision of Enterprise Physics: knowledge driven business process development for the end user. We demonstrate this vision along a concrete case study that became over the past three years a benchmark for Semantic Web Service discovery and mediation. We enhance the Mediation Scenario of the Semantic Web Service Challenge along the 2 central evolution paradigms that occur in practice: (a) Platform migration: platform substitution of a legacy system by an ERP system and (b) Backend extension: extension of the legacy Customer Relationship Management (CRM) and Order Management System (OMS) backends via an additional ERP layer.}, language = {en} } @book{Margaria2006, author = {Margaria, Tiziana}, title = {Denken in Services : Antrittsvorlesung 2006-12-14}, publisher = {Univ.-Bibl.}, address = {Potsdam}, year = {2006}, abstract = {Denken in Services ist der Schl{\"u}ssel zu einer gemeinsamen Sicht f{\"u}r IT Experten, Business Experten und Manager auf bestehende und entstehende Anwendungen und damit zu einer engeren Zusammenarbeit, die heutige Arbeitsabl{\"a}ufe revolutionieren kann: Auf der Service-Ebene ist es erstmals m{\"o}glich, Fachexperten kontinuierlich w{\"a}hrend des gesamten Lebens-zyklus einer Anwendung einzubinden. Ihren Ursprung hat die service- orientierte Denkweise in der Telekommunikation, wo sie die Grundlage der modernsten Anwendungen f{\"u}r mobile und feste Plattformen war, insbesondere der so genannten Mehrwertdienste, wie Televoting, Freephone (die 0800 Nummern), Virtual Private Network. Nur durch die f{\"u}r die service-orientierung charakteristische konsequente Virtualisierung der Infrastrukturen und die lose Kopplung der Funktionalit{\"a}ten war es m{\"o}glich, die hochgradig heterogene Landschaft der Telefonie zu beherrschen. Dieselben Prinzipien sind aber viel allgemeiner anwendbar, zum Beispiel auch f{\"u}r Dienste in weniger technischen Gesch{\"a}ftsbereichen wie e-commerce, Logistik, Gesundheitswesen oder Verwaltung. Ihre konsequente Umsetzung als neues Paradigma f{\"u}r die Konzeption, den Entwurf und das Management komplexer Anwendungen hat das Potential, der Gesellschaft eine neue Generation personalisierter, sicherer, hochverf{\"u}gbarer und effizienter (Internet-) Dienstleistungen zu bescheren. Damit werden viele Gesch{\"a}ftsbereiche revolutioniert, {\"a}hnlich wie bereits die Email in vielen Bereichen die klassische Kommunikation per Post revolutioniert hat.}, language = {de} } @article{MargariaSteffen2009, author = {Margaria, Tiziana and Steffen, Bernhard}, title = {Continuous model-driven engineering}, issn = {0018-9162}, year = {2009}, abstract = {Agility at the customer, user, and application level will prove key to aligning and linking business and IT}, language = {en} } @book{MargariaKubczakSteffen2007, author = {Margaria, Tiziana and Kubczak, Christian and Steffen, Bernhard}, title = {Bio-jETI: a Service Integration, Design, and Provisioning Platform for Orchestrated Bioinformatics Processes - ("part of From Components to Processes")}, series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik}, volume = {2007, 4}, journal = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik}, publisher = {Univ.}, address = {Potsdam}, issn = {0946-7580}, pages = {16 S.}, year = {2007}, language = {en} } @misc{LamprechtMargariaSteffen2009, author = {Lamprecht, Anna-Lena and Margaria, Tiziana and Steffen, Bernhard}, title = {Bio-jETI : a framework for semantics-based service composition}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-45066}, year = {2009}, abstract = {Background: The development of bioinformatics databases, algorithms, and tools throughout the last years has lead to a highly distributedworld of bioinformatics services. Without adequatemanagement and development support, in silico researchers are hardly able to exploit the potential of building complex, specialized analysis processes from these services. The Semantic Web aims at thoroughly equipping individual data and services with machine-processable meta-information, while workflow systems support the construction of service compositions. However, even in this combination, in silico researchers currently would have to deal manually with the service interfaces, the adequacy of the semantic annotations, type incompatibilities, and the consistency of service compositions. Results: In this paper, we demonstrate by means of two examples how Semantic Web technology together with an adequate domain modelling frees in silico researchers from dealing with interfaces, types, and inconsistencies. In Bio-jETI, bioinformatics services can be graphically combined to complex services without worrying about details of their interfaces or about type mismatches of the composition. These issues are taken care of at the semantic level by Bio-jETI's model checking and synthesis features. Whenever possible, they automatically resolve type mismatches in the considered service setting. Otherwise, they graphically indicate impossible/incorrect service combinations. In the latter case, the workflow developermay either modify his service composition using semantically similar services, or ask for help in developing the missing mediator that correctly bridges the detected type gap. Newly developed mediators should then be adequately annotated semantically, and added to the service library for later reuse in similar situations. Conclusion: We show the power of semantic annotations in an adequately modelled and semantically enabled domain setting. Using model checking and synthesis methods, users may orchestrate complex processes from a wealth of heterogeneous services without worrying about interfaces and (type) consistency. The success of this method strongly depends on a careful semantic annotation of the provided services and on its consequent exploitation for analysis, validation, and synthesis. We are convinced that these annotations will become standard, as they will become preconditions for the success and widespread use of (preferred) services in the Semantic Web}, language = {en} } @misc{MargariaKubczakSteffen2008, author = {Margaria, Tiziana and Kubczak, Christian and Steffen, Bernhard}, title = {Bio-jETI}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {822}, doi = {10.25932/publishup-42886}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-428868}, pages = {19}, year = {2008}, abstract = {Background: With Bio-jETI, we introduce a service platform for interdisciplinary work on biological application domains and illustrate its use in a concrete application concerning statistical data processing in R and xcms for an LC/MS analysis of FAAH gene knockout. Methods: Bio-jETI uses the jABC environment for service-oriented modeling and design as a graphical process modeling tool and the jETI service integration technology for remote tool execution. Conclusions: As a service definition and provisioning platform, Bio-jETI has the potential to become a core technology in interdisciplinary service orchestration and technology transfer. Domain experts, like biologists not trained in computer science, directly define complex service orchestrations as process models and use efficient and complex bioinformatics tools in a simple and intuitive way.}, language = {en} } @article{JoergesMargariaSteffen2011, author = {J{\"o}rges, Sven and Margaria, Tiziana and Steffen, Bernhard}, title = {Assuring property conformance of code generators via model checking}, series = {Formal aspects of computing : the international journal of formal methods}, volume = {23}, journal = {Formal aspects of computing : the international journal of formal methods}, number = {5}, publisher = {Springer}, address = {New York}, issn = {0934-5043}, doi = {10.1007/s00165-010-0169-9}, pages = {589 -- 606}, year = {2011}, abstract = {Automatic code generation is an essential cornerstone of today's model-driven approaches to software engineering. Thus a key requirement for the success of this technique is the reliability and correctness of code generators. This article describes how we employ standard model checking-based verification to check that code generator models developed within our code generation framework Genesys conform to (temporal) properties. Genesys is a graphical framework for the high-level construction of code generators on the basis of an extensible library of well-defined building blocks along the lines of the Extreme Model-Driven Development paradigm. We will illustrate our verification approach by examining complex constraints for code generators, which even span entire model hierarchies. We also show how this leads to a knowledge base of rules for code generators, which we constantly extend by e.g. combining constraints to bigger constraints, or by deriving common patterns from structurally similar constraints. In our experience, the development of code generators with Genesys boils down to re-instantiating patterns or slightly modifying the graphical process model, activities which are strongly supported by verification facilities presented in this article.}, language = {en} }