“When” and “Where” clauses in QVTo inherited mapping
As I pointed out in a previous post, the inheritance in operational QVT is semantically confusing. So yesterday I finally posted an issue in OMG about how the “when” and “where” clausesRead More…
Inheritance in QVTo
An interesting feature in QVT Operational Mapping language (QVTo) is mapping reuse. Differently from QVT Relations (QVTr), the QVTo language has some concepts that allow reusing mappings easily, and, more importantly, inRead More…
Using black box implementations in Eclipse QVTo
In QVT, it is possible to execute external code in a transformation. According to the standard, it has some benefits (QVT, 2009, p.10): It allows complex algorithms to be coded in anyRead More…
Transformation localization in QVTo
Last week I’ve decided to translate my QVTo transformation to Portuguese. I’m preparing an experiment that uses this transformation, and my subjects are Brazilian students. So it wouldn’t be appropriate to haveRead More…
Debugging queries in Medini QVT
Medini QVT was one of the first QVT tools to be available to the community – if not the first. To my knowledge, it is still the only functional QVT Relations tool.Read More…
Returning a Set in QVTo Mappings
In some situations, it is necessary to return a set of elements in a mapping. If this size of the set is predefined, it is possible to use a tuple. If theRead More…
“Hello world” in Eclipse QVTo
Although QVT isn’t a brand new specification (its first version is from April 2008), it is very difficult to find basic information about it and about how to use it. Since I’veRead More…