This object specifies an attribute value pair in the format
of attr=value [attr=value ...]. This string is limited to
255 characters. If the attribute value string is larger
than 255 characters, the string will be truncated to 254
characters and an '*' will be inserted as the 255th
character as a way to indicate the message was truncated.
Attributes and associated values are documented in the
CTX System user guide.