Software engineers usually have to face a large space of choices during the development process, including libraries/APIs, frameworks and UML models, which undermines their ability in finding the ones that best fit their needs. Recommender Systems appear as a solution to this problem since they have been applied successfully in other domains that suffer from similar issues. In this paper we propose to recommend UML Sequence Diagrams, a popular software artifact in many development processes, as an attempt to mitigate this problem. Our approach consists of: (i) a suitable representation of the users' information needs and sequence diagrams' content; and (ii) two content-based recommendation algorithms to recommend sequence diagrams that match the users' preferences. We performed a study with computer science subjects, where we generated recommendations with (ii) and measured the users' satisfaction upon these recommendations. Our preliminary results show that both algorithms are able to provide accurate recommendations.

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This paper presents a metamodel for the InputOutput Place-Transition nets (IOPT nets), a Petri net class targeted at controllers modeling. The proposed metamodel reuses many of the elements of the Petri Net Markup Language (PNML) metamodel, such as places, transitions, and arcs; it extends the PNML metamodel for Place/Transition nets to comprise concepts inherent to IOPT nets. The IOPT nets metamodel is described in Ecore format, putting IOPT nets in the puzzle of MDA artifacts taking benefit from the MDA infrastructure.

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