<para>
In this module, the Earth is assumed to be perfectly spherical.
(If that's too inaccurate for you, you might want to look at the
- <application><ulink url="http://www.postgis.org/">PostGIS</ulink></>
+ <application><ulink url="http://postgis.net/">PostGIS</ulink></>
project.)
</para>
contains several extensions, which are described in
<xref linkend="contrib">. Other extensions are developed
independently, like <application><ulink
- url="http://www.postgis.org/">PostGIS</ulink></>. Even
+ url="http://postgis.net/">PostGIS</ulink></>. Even
<productname>PostgreSQL</> replication solutions can be developed
externally. For example, <application> <ulink
url="http://www.slony.info">Slony-I</ulink></> is a popular