In epistemology, the prefix meta- is used to mean about (its own category).

For example, metadata are data about data (who has produced them, when, what format the data are in and so on). In a database, metadata are also data about data stored in a data dictionary and describe information (data) about database tables such as the table name, table owner, details about columns, – essentially describing the table.

In a rule-based system, a metarule is a rule that governs the application of other rules.

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