* the corresponding OID and the "virtual" SAN types (e.g.,
* %GNUTLS_SAN_OTHERNAME_XMPP).
*
+ * If an otherName OID is known, the data will be decoded. Otherwise
+ * the returned data will be DER encoded, and you will have to decode
+ * it yourself. Currently, only the RFC 3920 id-on-xmppAddr SAN is
+ * recognized.
+ *
* Returns the alternative subject name type on success. The type is
* one of the enumerated gnutls_x509_subject_alt_name_t. It will
* return %GNUTLS_E_SHORT_MEMORY_BUFFER if @ret_size is not large