public function getNextSibling()
	{
		$next = null;
		
		// if this element has an index
		if (false !== ($index = $this->getIndex())) {
			// if this element has a next sibling
			if ($this->parent->hasChild($index + 1)) {
				$next = $this->parent->getChild($index + 1);
			}
		}
			
		return $next;
	}