code: public Example addSibling()
      {
          if (hasSibling())
          {
              return sibling.addSibling();
          }
          else
          {
              sibling = createSpecification( tag, childTags );
              return sibling;
          }
      }
docs: <p>addSibling.</p>
  
  @return a {@link com.greenpepper.Example} object.