Semantic discovery and reuse of business process patterns

Patterns currently play an important role in modern information systems (IS) development and their use has mainly been restricted to the design and implementation phases of the development lifecycle. Given the increasing significance of business modelling in IS development, patterns have the potential of providing a viable solution for promoting reusability of recurrent generalized models in the very early stages of development. As a statement of research-in-progress this paper focuses on business process patterns and proposes an initial methodological framework for the discovery and reuse of business process patterns within the IS development lifecycle. The framework borrows ideas from the domain engineering literature and proposes the use of semantics to drive both the discovery of patterns as well as their reuse

[pt] UM MODELO DE BLOQUEIO MULTIGRANULAR PARA RDF

Em aplicações Web, sessões cliente são organizadas em transações, envolvendo requisições que leem e atualizam dados compartilhados. Executando concorrentemente, estas sessões podem invalidar os dados umas das outras. O advento do movimento Linked Data vem estimulando sobremaneira a criação de aplicações que empregam o modelo de dados RDF em sua camada de informação. Além de consultas aos dados RDF, também se faz presente o requisito de atualizações online, com adequado controle de concorrência. Este trabalho apresenta um modelo de bloqueio, inspirado no protocolo de bloqueio multigranular, voltado para isolamento entre transações que manipulam dados RDF, considerando quatro problemas de concorrência, a saber: lost updates, dirty reads, non-repeatable read e phantoms reads. São oferecidos quatro grânulos hierarquicamente relacionados, bem como novos tipos de bloqueio de escrita e leitura, especificamente criados para o modelo RDF. Por fim, o desempenho do modelo de bloqueio proposto é avaliado por meio de simulação.Client sessions in Web applications are organized as transactions involving requests that read and write shared data. Executing concurrently, these sessions may invalidate each other s data. The advent of Linked Data is spurring the deployment of applications that use the RDF data model at the information tier. In addition to querying RDF data, there is also the requirement for online updates with suitable concurrency control. This work presents a locking model, inspired by the multigranularity locking protocol, to address isolation between transactions that manipulate RDF data, considering four concurrency-related issues, namely: lost updates, dirty reads, non-repeatable reads and phantom reads. Four hierarchically related granules are offered, as well as new read and write lock modes, specifically created for the RDF data model. Finally, the performance assessment of the proposed locking model is done through simulation