super (Tag.A, AttributeSet.create ());
if ((href == null) || (href.length () == 0))
throw new IllegalArgumentException ("null or empty input: href");
if ((text == null) || (text.length () == 0))
throw new IllegalArgumentException ("null or empty input: text");
getAttributes ().set (Attribute.HREF, href);
// TODO: does href need to be URL-encoded?
setText (text, nbsp);