Here is a draft of the rows in 'column' for the message table:
message message_id natural_number ID for this message
message table label Table for this message
message row natural_number Row number for this message
message column label Column for this message
message value text Value of this cell as text
message level word Severity of this message: error, warn, info, debug
message rule label Name of the rule that generated this message
message message line Content of the message
Here is a draft of the rows in 'column' for the message table: