Bug 163013 Missing Document Type Definition (DTD) in the DOCTYPE declaration of the HTML output
engine/org.eclipse.birt.report.engine.emitter.html/src/org/eclipse/birt/report/engine/emitter/html/AttributeBuilder.java
* @param content
	 *            The <code>StringBuffer</code> to which the result is output.
	 * @param linethrough
	 *            The line-through value.
	 * @param underline
	 *            The underline value.
	 * @param overline
	 *            The overline value.
	 */
	private static void buildTextDecoration( StringBuffer content,
			String linethrough, String underline, String overline )
	{
		int flag = 0;
		if ( linethrough != null
				&& CSSConstants.CSS_LINE_THROUGH_VALUE
						.equalsIgnoreCase( linethrough ) ) 
		{
			flag = 1; 
		}
		if ( underline != null
				&& CSSConstants.CSS_UNDERLINE_VALUE
						.equalsIgnoreCase( underline ) ) 
		{
			flag |= 2; 
		}
		if ( overline != null
				&& CSSConstants.CSS_OVERLINE_VALUE.equalsIgnoreCase( overline ) ) 
		{
			flag |= 4; 
		}