code: public void appendNumberTag(final XMLUtil util, final Appendable appendable) throws IOException {
  		appendable.append("<number:number");
  		this.appendXMLAttributes(util, appendable);
  		appendable.append("/>");
  	}
docs: Append the number:number tag
  @param util an util
  @param appendable the destination
  @throws IOException if an I/O error occurs