Syntax Recovery for Uniface as a Domain Specific Language

This paper discusses the problems faced by the organisations who are running domain specific 4GL systems to deploy their core business logic. Given the fact that it is often not realistic to find new engineers for these not-widespread languages, the paper proposes a method to extract useful artefacts from 4GL systems which have the data stored in XML like format such as Uniface system. In this work, the authors show how to use Encapsulated Document Object Model to read Uniface XML and scan the content to extract the custom code. In addition, this paper introduces how to restore the code schema and visualise it.