Instant Messaging (IM) is in addition to Web and Email the most popular service on the Internet. With xOperator we present a strategy and implementation which deeply integrates Ins...
In seeking a unified study of computational effects, in particular in order to give a general operational semantics agreeing with the standard one for state, one must take account...
Empirical equations are an important class of regularities that can be discovered in databases. In this paper we concentrate on the role of equations as de nitions of attribute val...
We set up a formal framework to describe transition system specifications in the style of Plotkin. This framework has the power to express many-sortedness, general binding mechan...
Domain-specific modelling languages provide modelling means tailored to a particular domain. In Model-driven Engineering, it is common practice to specify such languages by modelli...