public function offsetGet($offset)
{
$loffset = strtolower($offset);
if (!isset($this->storage[$loffset])) {
$n = new TagMapItem($offset);
if (!TagInfo::basic_check($loffset)) {
return $n;
}
$this->storage[$loffset] = $n;
$this->sorted = false;
}
return $this->storage[$loffset];
}
