+.Pp
+Two additional utility functions are available to convert between sids and a string representation.
+String representations may be required, for example, when text files or XML files are used to save sid values.
+.Pp
+.Fn mbr_sid_to_string
+converts a sid into a string representation.
+The
+.Fa string
+parameter must be a buffer of at least 194 characters.
+The converted string is terminated with a nul character.
+.Pp
+.Fn mbr_string_to_sid
+converts an external string representation into a sid.