The figure below is a schematic of the control flow for processing a document for viewing. The original XML document is processed in R using the XSLT processor and Docbook stylesheet that we have extended for these purposes. This processing occurs using the R packages Sxslt and RwxWidgets and RwxDevice. We use the wxWidgets HTML viewer (also available via RwxWidgets to display the transformed document. Inlined OBJECT elements within a HTML document are processed by user-level R functions that create the appropriate interactive control and connect its actions to evaluating the relevant code within the document and updating the display.
