In this article we present a metamodeling tool that is strictly oriented towards the needs of the working domain expert. The working domain expert longs for intuitive metamodeling features. In particular this concerns rich capabilities for specifying the visual appearance of models. In these efforts we have identified an important design rationale for metamodeling tools that we call visual reif...

Since Smith seminal work, there have been numerous reflective language definition and implementation proposals. These proposals, initially restricted to functional languages, have been quickly extended to object-oriented languages. Unfortunately, reflective objectoriented language definitions remained mostly ad hoc. In this paper, we present a generic reification technique which enables the sel...

Building systems from existing applications and data sources is common practice. Semi-structured data sources, such as XML, HTML, and databases, and programming languages, such as C# and Java, conform to welldefined, albeit different, type systems, each with their own unique underlying representations. As a consequence, writing programs that access and update data in foreign type systems (FTSs)...

While the current mechanism of reification in RDF is without semantics and widely considered inappropriate and cumbersome, some form of reification – speaking about triples themselves – is needed in RDF for many reasonable applications: in particular, reification allows for enhancing triples with annotations relating to provenance, spatio-temporal validity, degrees of trust, fuzzy values and/or...