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Column ID
The letter (A, B, ... AA, AB) identifying each column's position in a record layout.
Each record layout identifies its columns by a Column ID letter. The protocol refers to columns by these IDs in its rules, such as Column ID P (Date of Determination) for Table 1's period check.
Sources: ODAG protocol, Universe Table 1 guidance, PDF p. 17; SNPCC protocol, Universe Table 1 SNPE, Column ID J (PDF p. 11).