Cataloger's Reference Shelf
MARC 21 Specifications for Record Structure, Character Sets, and Exchange
Media
Control Function Codes (Character Sets, Part 1: General Character Set Issues)
Eight characters are specifically designated as control characters for MARC 21 use:
escape character, 1B(hex) in MARC-8 and Unicode encoding
subfield delimiter, 1F(hex) in MARC-8 and Unicode encoding
field terminator, 1E(hex) in MARC-8 and Unicode encoding
record terminator, 1D(hex) in MARC-8 and Unicode encoding
non-sorting character(s) begin, 88(hex) in MARC-8 and 98(hex) in Unicode encoding
non-sorting character(s) end, 89(hex) in MARC-8 and 9C(hex) in Unicode encoding
joiner, 8D(hex) in MARC-8 and 200D (hex) in Unicode encoding
nonjoiner, 8E(hex) in MARC-8 and 200C (hex) in Unicode encoding.
These are the only control characters that may be used in MARC-8 encoded records. The joiner and nonjoiner characters are sometimes required to control the display form of graphic characters whose proximity to other characters affects their shape; as can happen, for example, in the Arabic script. Specifications for use of the sorting control characters are contained in the MARC 21 Format for Bibliographic Data.
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