Jan Pettersen Nytun

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In the scope of meta-modelling it is important to consider descriptions sometimes as a model and sometimes as a metamodel, e.g. the UML metamodel which is a metamodel for UML and at the same time a model in terms of MOF. For this handling to be easy, this article describes a meta-level representation that includes both aspects. It covers the most important(More)
The number of online data sources is continuously increasing, and related data are often available from several sources. However accessing data from multiple sources is hindered by the use of different languages and schemas at the sources, as well as by inconsistencies among the data. There is thus a growing need for tools that enable the testing of(More)
In the standard generative Model-driven Architecture (MDA), adapting the models of an existing system requires re-generation and restarting of that system. This is due to a strong separation between the modeling environment and the runtime environment. Certain current approaches remove this separation, allowing a system to be changed smoothly when the model(More)
The Model-Driven Architecture (MDA) is based on an understanding of a hierarchy of levels that are placed on top of each other and that are connected with instantiation. For practical MDA use, it is important to be clear about the kinds of objects that reside on the different levels and the relations between them as well as relations to objects outside of(More)
As the information society develops, the “digital divide” grows. On the other hand, appropriate uses of new technologies can bridge the divide and enable new user groups to access information and participate in communication. In particular, people with disabilities may benefit from the development. We propose a tool to monitor the accessibility to content(More)