/*
 * call-seq:
 *  next_sibling
 *
 * Returns the next sibling node
 */
static VALUE next_sibling(VALUE self)
{
  xmlNodePtr node, sibling;
  Data_Get_Struct(self, xmlNode, node);

  sibling = node->next;
  if(!sibling) return Qnil;

  return Nokogiri_wrap_xml_node(sibling) ;
}