DirectoryString is defined in RFC 4517 and the OID for DirectoryString is 1.3.6.1.4.1.1466.115.121.1.15
A zero-length character string is not permitted.
The LDAP-specific encoding of a value of this syntax is the UTF-8 encoding RFC 3629 of the character string. Such encodings conform to the following ABNF:
DirectoryString = 1*UTF8
The <UTF8> rule is defined in RFC 4512.
Example: This is a value of Directory String containing
#!%#@
Servers and clients MUST be prepared to receive arbitrary UCS code points, including code points outside the range of printable ASCII and code points not presently assigned to any character.
Attribute type definitions using the Directory String syntax should not restrict the format of DirectoryString values, e.g., by requiring that the character string conforms to specific patterns described by ABNF. A new syntax should be defined in such cases.
The LDAP-specific encoding of a value of this syntax is defined by the DirectoryString rule in RFC 4512.
The OID for DirectoryString is 1.3.6.1.4.1.1466.115.121.1.15