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NEN-ISO/IEC 9075-4 specifies the syntax and semantics of a database language for declaring and maintaining persistent database language routines in SQL-server modules. The database language for s and s includes: - The specification of statements to direct the flow of control. - The assignment of the result of expressions to variables and parameters. - The specification of condition handlers that allow SQL-invoked routines to deal with various conditions that arise during their execution. - The specification of statements to signal and resignal conditions. - The declaration of standing SQL-server cursors. - The declaration of local variables. It also includes the definition of the Information Schema tables that contain schema information pertaining to SQL-server modules and SQL-invoked routines.