code: public void setHrefLang(String hreflang) {
          _anchorState.registerAttribute(AbstractHtmlState.ATTR_GENERAL, HtmlConstants.HREFLANG, hreflang);
      }
docs: Sets <code>hreflang</code> attribute for the anchor.
  
  @param hreflang the hreflang attribute
  @jsptagref.attributedescription The hrefLang attribute for the HTML anchor.
  @jsptagref.attributesyntaxvalue <i>string_hreflang</i>
  @netui:attribute required="false"  rtexprvalue="true" description="The HREF lang attribute for the HTML anchor."