| The column value descriptor (CVD) contains a description of a column value. During field-encoding, the I CVD describes the value to be encoded. During field-decoding, it describes the decoded value to be I supplied by the field procedure. During field-definition, it describes the column as defined in the I CREATE TABLE or ALTER TABLE statement. | The field value descriptor (FVD) contains a description of a field value. During field-encoding, the FVD I describes the encoded value to be returned from the field procedure. During field-decoding, it describes I the value to be decoded. During field-definition a description of the encoded value must put into the I FVD.

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