final Document doc = DocumentBuilderUtil.parse(builder, ResourceUtil.getResourceAsStream("org/codelibs/core/xml/test1.xml"));
        final Element root = doc.getDocumentElement();
        final String contents = DomUtil.toString(root);
        System.out.println(contents);
    }

     */
    public static String toString(final Document document) {
        assertArgumentNotNull("document", document);

        final StringBuilder buf = new StringBuilder(1000);
        appendElement(document.getDocumentElement(), buf);
        return new String(buf);
    }

    /**
     * Converts an {@link Element} to a string.
     *
     * @param element
     *            The element. Must not be {@literal null}.