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+@deftypefun {int} {gnutls_x509_dn_oid_known} (const char * @var{oid})
+@var{oid}: holds an Object Identifier in a null terminated string
+
+This function will inform about known DN OIDs. This is useful since
+functions like @code{gnutls_x509_crt_set_dn_by_oid()} use the information
+on known OIDs to properly encode their input. Object Identifiers
+that are not known are not encoded by these functions, and their
+input is stored directly into the ASN.1 structure. In that case of
+unknown OIDs, you have the responsibility of DER encoding your
+data.
+
+@strong{Returns:} 1 on known OIDs and 0 otherwise.
+@end deftypefun