Abstract : The domain of XML transformations is becoming more and more important as a result of the increasing number of applications adopt- ing XML as their format for data exchange or representation. Most of the existing solutions for expressing XML transformations are textual languages, such as XSLT or DOM combined with a general- purpose programming language. Several tools build on top of these languages, providing a graphical environment. Transformations are however still specified in a textual way using the underlying lan- guage (often XSLT), thus requiring the user to learn the associated textual language. We believe that visual programming techniques are well-suited to representing XML structures and make the specification of trans- formations simpler. We present a visual programming language for the specification of XML transformations in an interactive environ- ment, based on a zoomable user interface toolkit. Transformations can be run from the application or exported to two target languages: XSLT and Circus, a general-purpose structure transformation lan- guage designed by the second author and briefly introduced in this paper.
