The Leader, Directory, and all content designation in MARC 21 records must be encoded using only the repertoire found in Code for Information Interchange (ASCII) (ANSI X3.4) or its international counterpart, ISO 646 (IRV).  The encoding of these characters in the MARC-8 and Unicode encodings is identical in the two MARC 21 encoding schemes, when the Unicode form is UTF-8.

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Part 1:  General Character Set Issues

Character Sets and Encoding Options