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Normally, records are separated by newline characters. You can control how records are separated by assigning values to the built-in variable RS. ...
If RS is set to the null string, then records are separated by blank lines.
As each input record is read, gawk splits the record into fields, using the value of the FS variable as the field separator. If FS is a single character, felds are separated by that character. If FS is the null string, then each individual character becomes a separate field. Otherwise, FS is expected to be a full regular expression.
Setting FS to "@[^:]*: *" we assume that records are separated by strings beginning with @, not containing semicolons in the middle and ending with semicolon, possibly followed by spaces.