for (String root : EXPRESSION_ROOTS) {
                try (InputStream docStream =
                        docLoader.getResourceAsStream(EXPRESSION_DOCO_ROOTPATH + root + ".paramdoc.xml")) {
                    if (docStream != null) {
                        Map<String, Expression> doco = parseExpressionDocumentation(docStream);

                        expressionDocumentation.putAll(doco);