Those who cannot remember the past are condemned to repeat it (George Santayana). I've always felt ambivalent about that quote. History never ever repeats itself exactly. In computer science on the other hand, it applies very well. In all our collective software applications, we recalculate the same results time and time again and are therefore faced with constant question to remember or not to remember. In this blog series, I'm going to talk about a cache for Xtext resources that we've developed over the past year.

Thanks to Ian Bull on Eclipse Con Europe last week, I finally found out how to set the update description for an RCP product update. This was a tiny annoyance that has been itching since the first release of Sigasi. For the Eclipse plugin version of Sigasi, this never was a problem. The feature description is shown in the update dialog.

By default Xtext generates its own ecore model from your grammar. The rules governing this process are not extremely complex but still can interact in surprising ways.