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The Relational package describes data accessible through a relational interface such as a native RDBMS, ODBC, or JDBC. The
Relational package is based on the [SQL] standard section concerning RDBMS catalogs.
The scope of the top level container, Catalog, is intended to cover all the tables a user can use in a single statement. A
catalog is also the unit that is managed by a data resource. A catalog contains schemas which themselves contain tables. Tables
are made of columns that have an associated data type.
The Relational package uses constructs in the ObjectModel package to describe the object extensions added to SQL by the [SQL]
standards.
The Relational package also addresses the issues of indexing, primary keys, and foreign keys by extending the corresponding
concepts from the Foundation packages.