This metapackage always depends on the currently supported postgresql database documentation package.

postgresql is a fully featured object-relational database management system. it supports a large part of the sql standard and is designed to be extensible by users in many aspects. some of the features are: acid transactions, foreign keys, views, sequences, subqueries, triggers, user-defined types and functions, outer joins, multiversion concurrency control. graphical user interfaces and bindings for many programming languages are available as well.