ASCII graphics are the default G0 set and ANSEL graphics are the default G1 set for MARC 21 records. ASCII graphics are invoked as the working set for codes 21(hex) through 7E(hex). ANSEL, a graphic character set of nonspacing and spacing marks and special signs, is designated as the graphic G1 set, invoked as the working set for codes A1(hex) through FE(hex). These are the default working sets for data transcribed in the fields and subfields unless other default sets are specified in the record field 066 (Character Sets Present). Additional graphic character sets may also be accessed using special techniques. Upon exit from a subfield, ASCII must be designated the G0 set.

There are two special characters positions in every "G" code block (e.g., G0) assigned to graphic characters; one at the beginning (20(hex) or A0(hex) in an 8-bit environment) and one at the end (7F(hex) or FF(hex) in an 8-bit environment).

image\DOTNAVY.gif The space character, which is interpreted both as a graphic character and as a control character, occupies 20(hex). In MARC 21 records, it is used in indicators, coded data elements, and variable fields. This character is also referred to as "blank" in MARC 21 documentation.

image\DOTNAVY.gif The delete character occupies the second of the two special character positions. It is a control character that is not used in MARC 21 records.

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Part 1: MARC-8 Environment (Character Sets)

Character Sets