3.1.1.2.2.2.1 Object(DN-String)
A value with this syntax is a UTF-8 string in the following format:
S:byte_count:string_value:object_DN
where byte_count is the number (in decimal) of bytes in the string_value string, object_DN is a DN in Object(DS-DN) form, and all remaining characters are string literals. Since string_value is a UTF-8 string, one character can require more than one byte to represent it.