An introduction to Greenfox, a schema language describing file system contents

Schema validation is like a prototype of the declarative approach – to describe, rather than to code. The tutorial introduces to Greenfox, a schema language for file system contents. Resources are described by shapes, which are sets of constraints. The goals of the tutorial are twofold. First, it should help to get started with using Greenfox. Second, it should awake an awareness that the same set of constraints can be described in a less or more declarative way. This possibility is above all opened by a new possibility, offered by the upcoming version of Greenfox, to describe resource relationships independently of the constraints using them. Participants might acquire an increased awareness that it is not sufficient to ask “if” declarative or not, but we should also ask “how” declarative, think about degrees of declarativeness.