Schematron validations (of XML sources) are performed by Medical Editors and Content Managers during editing in <oXygen /> XML Editor. There is even a batch based pipeline integrated in the content management system to perform a Schematron validation using Skeleton that generats an easy to understand PDF from the SVRL report. Unfortunenatly this Skeleton implementation isn't integrated in the existing batches for the exports. Therefore the XProc 3.0 pipeline should perform a additional Schematron validation when the DTD validation mentioned above is done.