code: private void addAdjacentSiblingElements() {
  		for (Node node : nodes) {
  			Node n = helper.getNextSibling(node);
  			if (n != null)
  				if (matchTag(n))
  					result.add(n);
  		}
  	}
docs: Add adjacent sibling elements.
  
  @see <a href="http://www.w3.org/TR/css3-selectors/#adjacent-sibling-combinators">Adjacent sibling combinator</a>