22.7 CDD/Repository Variants
  A variant comprises two or more fields of a record that
  provide alternative descriptions for the same portion of a
  record.

  The following is an example of a CDDL data definition con-
  taining variant fields and the corresponding BASIC RECORD
  statement:

  CDDL Definition
  EXAMPLE: Click to display example.

  Translated RECORD Statement
  EXAMPLE: Click to display example.

  CDD/Repository data definitions sometimes contain VARIANTS
  OF field description statements as well as simple variants.
  A CDDL or CDO VARIANTS OF statement names a tag
  variable whose value at run time determines which of the
  variant fields is the current variant. BASIC does not sup-
  port the VARIANTS OF statement. If a CDD/Repository
  data definition containing a VARIANTS OF statement is
  extracted, BASIC signals the informational message, ``<num-
  ber> tag value from CDD/Repository ignored'' and treats the
  VARIANTS OF as an ordinary variant and ignores the tag
  value.