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Updating the contents of an information base may violate some of the constraints defined over the schema. The classical way to deal with this problem has been to reject the requested update when its application would lead to some constraint violation. We follow here an alternative approach aimed at automatically computing the repairs of an update, i.e., the minimum additional changes that, when applied together with the requested update, bring the information base to a new state where all constraints are satisfied. Our approach is independent of the language used to define the schema and the constraints, since it is based on a logic formalization of both, although we apply it to UML and OCL because they are widely used in the conceptual modeling community.Our method can be used for maintaining the consistency of an information base after the application of some update, and also for dealing with the problem of fixing up non-executable operations. The fragment of OCL that we use to define the constraints has the same expressiveness as relational algebra and we also identify a subset of it which provides some nice properties in the repair-computation process. Experiments are conducted to analyze the efficiency of our approach.

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Abstract. Schema.org offers to web developers the opportunity to enrich a website's content with microdata and schema.org. For large websites, implementing microdata can take a lot of time. In general, it is necessary to perform two main activities, for which we lack methods and tools. The first consists in designing what we call the website schema.org, which is the fragment of schema.org that is relevant to the website. The second consists in adding the corresponding microdata tags to the web pages. In this paper, we describe an approach to the design of a website schema.org. The approach consists in using a human-computer task-oriented dialogue, whose purpose is to arrive at that design. We describe a dialogue generator that is domainindependent, but that can be adapted to specific domains. We propose a set of six evaluation criteria that we use to evaluate our approach, and that could be used in future approaches.

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Abstract. Schema.org offers to web developers the opportunity to enrich a website's content with microdata and schema.org. For large websites, implementing microdata can take a lot of time. In general, it is necessary to perform two main activities, for which we lack methods and tools. The first consists in designing what we call the website schema.org, which is the fragment of schema.org that is relevant to the website. The second consists in adding the corresponding microdata tags to the web pages. In this paper, we describe an approach to the design of a website schema.org. The approach consists in using a human-computer task-oriented dialogue, whose purpose is to arrive at that design. We describe a dialogue generator that is domainindependent, but that can be adapted to specific domains. We propose a set of six evaluation criteria that we use to evaluate our approach, and that could be used in future approaches.

Abstract. A big challenge for education and research in Requirements Engineering and Conceptual Modeling (RE/CM) is the need for much more empirical research about the use in practice of RE/CM, including the practical impact of CM education. Former students of RE/CM are potential prescriptors of the RE/CM concepts, methodologies and tools that they have learnt, but they are also conditioned by the current use of those same issues in practice. In this paper we focus on the views that former students of a RE/CM course have, now as young professionals, on the usefulness of the received CM education. We have surveyed over 70 former students to know their opinions on the usefulness of the education on a representative set of CM artifacts. Our results show that our former students find quite useful in general their received CM education, with different usefulness degrees for the various learned artifacts.