/*
 * call-seq:
 *  href
 *
 * Get the href for this namespace
 */
static VALUE href(VALUE self)
{
  xmlNsPtr ns;
  xmlDocPtr doc;

  Data_Get_Struct(self, xmlNs, ns);
  if(!ns->href) return Qnil;

  Data_Get_Struct(rb_iv_get(self, "@document"), xmlDoc, doc);

  return NOKOGIRI_STR_NEW2(ns->href);
}