ANSEL DESIGNATED/INVOKED BY TWO BYTES, NOT ONE:
This is a clarification of information on the newly assigned escape
sequence for designating and invoking ANSEL, the Extended Latin character
set used in MARC 21.
The email notification of the escape sequence assigned to the extended
Latin set (ANSI/NISO Z39.47) provided information about the final
character of the escape sequence only, which was identified as hexadecimal
45 (the uppercase letter "E"). The text of the registration itself,
however, indicates that final part of the escape sequence for ANSEL is
actually two bytes, hexadecimal 21 ("!") followed by hexadecimal 45
("E"). Although "E" is the final character, it appears that the pair
hex 21 45 ("!E") would need to be used in MARC 21 records to designate
and/or invoke ANSEL. This is important with regard to the application of
ISO 2022 which specifies the technique for using escape sequences to
change character sets. ISO 2022 does not indicate that the final portion
of the escape sequence is restricted to a single character. Please make
note of this clarification when implementing any escape sequences to
designate and/or invoke ANSEL (ANSI/NISO Z39.47)
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