code: public XHTMLText appendOpenOrderedListTag(String style) {
          text.halfOpenElement(OL);
          text.optAttribute(STYLE, style);
          text.rightAngleBracket();
          return this;
      }
docs: Appends a tag that creates an ordered list. "Ordered" means that the order of the items
  in the list is important. To show this, browsers automatically number the list.
  
  @param style the style of the ordered list
  
  @return this.