XN_FLAG_RFC2253

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) nothrow
enum XN_FLAG_RFC2253 = ASN1_STRFLGS_RFC2253 | XN_FLAG_SEP_COMMA_PLUS | XN_FLAG_DN_REV | XN_FLAG_FN_SN | XN_FLAG_DUMP_UNKNOWN_FIELDS;

Meta