public void message(XdmNode content, boolean terminate, javax.xml.transform.SourceLocator locator) {
TreeWriter treeWriter = new TreeWriter(runtime);
treeWriter.startDocument(content.getBaseURI());
treeWriter.addStartElement(XProcConstants.c_error);
treeWriter.startContent();
treeWriter.addSubtree(content);
treeWriter.addEndElement();
treeWriter.endDocument();