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Ara es mostren els items 59-78 de 103

    • OCL-Lite: a decidable (yet expressive) fragment of OCL 

      Queralt Calafat, Anna; Artale, Alessandro; Calvanese, Diego; Teniente López, Ernest (2012)
      Text en actes de congrés
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      UML has become a de facto standard in conceptual modeling. Class diagrams in UML allow one to model the data in the domain of interest by specifying a set of graphical constraints. However, in most cases one needs to provide ...

    • OCLFO: first-order expressive OCL constraints for efficient integrity checking 

      Franconi, Enrico; Mosca, Alessandro; Oriol Hilari, Xavier; Rull, Guillem; Teniente López, Ernest (2019-08)
      Article
      Accés obert
      OCL is the standard language for defining constraints in UML class diagrams. Unfortunately, as we show in this paper, full OCL is so expressive that it is not possible to check general OCL constraints efficiently. In ...

    • OCLuniv: Expressive UML/OCL conceptual schemas for finite reasoning 

      Oriol Hilari, Xavier; Teniente López, Ernest (Springer, 2017)
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      Full UML/OCL is so expressive that most reasoning tasks are known to be undecidable in schemas defined with these languages. To tackle this situation, literature has proposed mainly three decidable fragments of UML/OCL: ...

    • On the practical applicability of current techniques for reasoning on the structural schema 

      Teniente López, Ernest (Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, 2013)
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      There has been plenty of promising results for providing automated reasoning on the structural part of the conceptual schema and several prototype tools have been developed with this purpose. However, most of these results ...

    • On the semantics of operation contracts in conceptual modeling 

      Queralt Calafat, Anna; Teniente López, Ernest (2004-04)
      Report de recerca
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      This paper describes two different ways of understanding operation contracts in the context of conceptual modeling. These two points of view are based in the total and partial correctness approaches from axiomatic programming, ...

    • Ontology-based mappings 

      Mecca, Giansalvatore; Rull, Guillem; Santoro, Donatello; Teniente López, Ernest (Elsevier, 2015-07-01)
      Article
      Accés obert
      Data translation consists of the task of moving data from a source database to a target database. This task is usually performed by developing mappings, i.e. executable transformations from the source to the target schema. ...

    • Panel discussion: Proposals for improving OCL 

      Brucker, Achim D.; Clark, Tony; Dania, Carolina; Georg, Geri; Gogolla, Martin; Jouault, Frederic; Teniente López, Ernest; Wolff, Burkhart (CEUR-WS.org, 2014)
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      During the panel session at the OCL workshop, the OCL community discussed, stimulated by short presentations by OCL experts, potential future extensions and improvements of the OCL. As such, this panel discussion continued ...

    • Potenciació del Moodle per a donar suport a l'aprenentatge semi-presencial 

      Abelló Gamazo, Alberto; Urpí Tobella, Antoni; Rodríguez, Elena; Burgués Illa, Xavier; Quer, Carme; Casany Guerrero, María José; Martín Escofet, Carme; Teniente López, Ernest; Muñoz, Jorge; Munné, Enric (2009-02-12T12:05:55Z)
      Text en actes de congrés
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      L’objectiu general del projecte era permetre que els alumnes preparessin les sessions de pràctiques amb antelació i de forma autònoma i fomentar que reintentessin els exercicis permetent-los millorar les seves qualificacions. ...

    • Practical update management in ontology-based data access 

      Giacomo, Giuseppe De; Lembo, Domenico; Oriol Hilari, Xavier; Savo, Domenico Fabio; Teniente López, Ernest (Springer, 2017)
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      Ontology-based Data Access (OBDA) is gaining importance both scientifically and practically. However, little attention has been paid so far to the problem of updating OBDA systems. This is an essential issue if we want to ...

    • Process conformance checking by relaxing data dependencies 

      Estañol Lamarca, Montserrat; Mazuran, Mirjana; Oriol Hilari, Xavier; Tanca, Letizia; Teniente López, Ernest (CEUR-WS.org, 2017)
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      Given the events modeled by a business process, it may happen in the presence of alternative execution paths that the data required by a certain event determines somehow what event is executed next. Then, the process can ...

    • Providing explanations for database schema validation 

      Rull Fort, Guillem; Farré Tost, Carles; Teniente López, Ernest; Urpí Tubella, Antoni (Universitat Politècnica de Catalunya. Departament de Llenguatges i Sistemes Informàtics, 2008-04-14)
      Report de recerca
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      We propose a new method for database schema validation that provides an explanation when it determines that a certain desirable property of a database schema does not hold. Explanations are required to give the designer a ...

    • Query containment checking as a view updating problem 

      Farré Tost, Carles; Teniente López, Ernest; Urpí Tubella, Antoni (1998-06)
      Report de recerca
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      In this paper we present a new approach that handles query containment problems by expressing them as a view updating problem. Since this approach is independent of any particular view updating method, it provides a ...

    • Query containment in entity SQL 

      Rull Fort, Guillem; Bernstein, Philip A.; Garcia dos Santos, Ivo; Katsis, Yannis; Melnik, Sergey; Teniente López, Ernest (2013)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      We describe a software architecture we have developed for a constructive containment checker of Entity SQL queries defined over extended ER schemas expressed in Microsoft's Entity Data Model. Our application of interest ...

    • Query containment with negated IDB predicates (extended version) 

      Teniente López, Ernest; Farré Tost, Carles; Urpí Tubella, Antoni (2003-05)
      Report de recerca
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      We present a method that checks Query Containment for queries with negated IDB predicates. Existing methods either deal only with restricted cases of negation or do not check actually containment but uniform containment, ...

    • Reasoning on the usage control security policies over data artifact business process models 

      Estañol Lamarca, Montserrat; Varela Vaca, Ángel Jesús; Gómez López, María Teresa; Teniente López, Ernest; Martínez Gasca, Rafael (2022)
      Article
      Accés obert
      The inclusion of security aspects in organizations is a crucial aspect to ensure compliance with both internal and external regulations. Business process models are a well-known mechanism to describe and automate the ...

    • Reasoning on UML class diagrams with OCL constraints 

      Queralt Calafat, Anna; Teniente López, Ernest (2006-04)
      Report de recerca
      Accés obert
      We propose a new approach to check whether a given UML class diagram with its OCL integrity constraints satisfies a set of desirable properties such as schema satisfiability, class liveliness, redundancy of integrity ...

    • Reasoning on UML data-centric business process models 

      Estañol Lamarca, Montserrat; Sancho Samsó, María Ribera; Teniente López, Ernest (Springer, 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Verifying the correctness of data-centric business process models is important to prevent errors from reaching the service that is offered to the customer. Although the semantic correctness of these models has been studied ...

    • Semantics for connectivity management in IoT sensing 

      Vila Gómez, Marc; Sancho Samsó, María Ribera; Teniente López, Ernest; Vilajosana Guillén, Xavier (Springer Nature, 2021)
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      There are a large number of Internet of Things (IoT) devices that transmit information over the Internet, each with a different data format to denote the same semantic concept. This often leads to data incompatibilities ...

    • Simplification of UML/OCL schemas for efficient reasoning 

      Oriol Hilari, Xavier; Teniente López, Ernest (2017-06-01)
      Article
      Accés obert
      Ensuring the correctness of a conceptual schema is an essential task in order to avoid the propagation of errors during software development. The kind of reasoning required to perform such task is known to be exponential ...

    • Soundness and completeness of the events method 

      Teniente López, Ernest (1992)
      Report de recerca
      Accés obert
      We have proposed a new method, which we call the Events Method, for view updating in deductive databases. In this paper we prove that this method is sound and complete for stratified databases.