List<String> element = transformations.stream().filter((t) -> !CoreBPEL.XSL_SHEETS.contains(t)).collect(Collectors.toList());
if (!element.isEmpty()) {
throw new IllegalArgumentException("Given transformations " + element + " are not a valid CoreBPEL transformations");
}
engine.setPackageBuilder(new EnginePackageBuilder() {
@Override
public void createFolderAndCopyProcessFilesToTarget(BPELProcess process) {
super.createFolderAndCopyProcessFilesToTarget(process);
CoreBPEL coreBPEL = new CoreBPEL(process.getTargetTmpPath(), process.getTargetProcessFilePath());