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2 H.4. Extensions #
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4    PostgreSQL is designed to be easily extensible. For this reason,
5    extensions loaded into the database can function just like features
6    that are built in. The contrib/ directory shipped with the source code
7    contains several extensions, which are described in Appendix F. Other
8    extensions are developed independently, like PostGIS. Even PostgreSQL
9    replication solutions can be developed externally. For example, Slony-I
10    is a popular primary/standby replication solution that is developed
11    independently from the core project.