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referential integrity

(1) The state of a database in which all values of all foreign keys are valid. Maintaining referential integrity requires the enforcement of a referential constraint on all operations that change the data in a table where the referential constraints are defined.
(2) The condition that exists when all intended references from data in one column of a table to data in another column of the same or a different table are valid.
(3) In Extensible Markup Language (XML) tools, the condition that exists when all references to items in the XML schema editor or DTD editor are automatically cleaned up when the schema is detected or renamed.

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