It is now more than fifty years since the first paper on formal specifications of an information
system was published by Young and Kent. Even if the term “conceptual model” was not used …

Most current conceptual modeling languages and methods do not model events as entities.
We argue that, at least in object-oriented (OO) languages, modeling events as entities …

The relational data model has become the standard for mainstream database processing
despite its well-known weakness in the area of representing application semantics. The …

There is an abundant literature on Ethereum, but as far as we know what is missing is its
explicit conceptual schema. We present here the conceptual schema of Ethereum in UML …

We propose three new methods for the definition of derivation rules in OO conceptual
modeling languages. The first method applies to static rules, and associates each derived …

Relationship reification is a well-known schema transformation in conceptual modeling of
information systems. Traditionally, reification has been studied only for single state …

In a conceptual schema that includes specializations and generalizations, and that allows
multiple classification, an entity may be, at a given time, instance of one or more entity types …

It is widely recognised that information and communication technologies development is a
risky activity. Despite the advances in software engineering, many software development …

Most current conceptual modeling languages and methods do not model events as entities.
We argue that, at least in Object-Oriented (OO) languages, modeling events as entities …

It is common to find that the definition or common usage of a data modelling language
causes there to be restrictions placed on the evolution of data values that are associated …