The SQL/Schemata, or Information and Definition Schemas, part of the SQL standard is defined by ISO/IEC 9075-11:2008. SQL/Schemata defines the information schema and definition schema, providing a common set of tools to make SQL databases and objects self-describing. These tools include the SQL object identifier[clarify], structure[clarify] and integrity constraints, security and authorization specifications[clarify], features and packages[clarify] of ISO/IEC 9075, support of features provided by SQL-based DBMS implementations, SQL-based DBMS implementation information and sizing items[clarify], and the values supported[clarify] by the DBMS implementations.[1] SQL/Schemata defines a number of features, some of which are mandatory.
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