Here's the definition of LANGUAGE_TYPE_URL in locale_language_types_info() (see: http://api.drupal.org/api/drupal/modules!locale!locale.module/function/locale_language_types_info/7)
<?php
LANGUAGE_TYPE_URL => array(
'fixed'=> array(LOCALE_LANGUAGE_NEGOTIATION_URL, LOCALE_LANGUAGE_NEGOTIATION_URL_FALLBACK),
),
?>Is there a particular reason why it doesn't have a name and description? This is a problem whenever someone wants to make this language type configurable.