--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+ <sect1 id="PostGIS_Types">
+ <title>PostgreSQL PostGIS Types</title>
+
+ <refentry id="box2d">
+ <refnamediv>
+ <refname>box2d</refname>
+ <refpurpose>A box composed of x min, ymin, xmax, ymax. Often used to return the 2d enclosing box of a geometry. </refpurpose>
+ </refnamediv>
+
+ <refsection>
+ <title>Description</title>
+ <para>box2d is a spatial data type used to represent the enclosing box of a geometry or set of geometries. ST_Extent in earlier versions prior to PostGIS 1.4 would return a box2d.</para>
+ </refsection>
+ </refentry>
+ <refentry id="box3d">
+ <refnamediv>
+ <refname>box3d</refname>
+ <refpurpose>A box composed of x min, ymin, zmin, xmax, ymax, zmax. Often used to return the 3d extent of a geometry or collection of geometries. </refpurpose>
+ </refnamediv>
+
+ <refsection>
+ <title>Description</title>
+ <para>box3d is a postgis spatial data type used to represent the enclosing box of a geometry or set of geometries. ST_Extent3D returns a box3d object.</para>
+ </refsection>
+ </refentry>
+
+ <refentry id="box3d_extent">
+ <refnamediv>
+ <refname>box3d_extent</refname>
+ <refpurpose>A box composed of x min, ymin, zmin, xmax, ymax, zmax. Often used to return the extent of a geometry.</refpurpose>
+ </refnamediv>
+
+ <refsection>
+ <title>Description</title>
+ <para>box3d_extent is a data type returned by ST_Extent. In versions prior to PostGIS 1.4, ST_Extent would return a box2d.</para>
+ </refsection>
+ <refsection>
+ <title>Casting Behavor</title>
+ <para>This section lists the automatic as well as explicit casts allowed for this data type</para>
+ <informaltable>
+ <tgroup cols="2">
+ <tbody>
+ <row>
+ <entry>Cast To</entry>
+ <entry>Behavior</entry>
+ </row>
+ <row>
+ <entry>box2d</entry>
+ <entry>automatic</entry>
+ </row>
+ <row>
+ <entry>box3d</entry>
+ <entry>automatic</entry>
+ </row>
+ <row>
+ <entry>geometry</entry>
+ <entry>automatic</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </informaltable>
+ </refsection>
+ </refentry>
+
+ <refentry id="geometry">
+ <refnamediv>
+ <refname>GEOMETRY</refname>
+ <refpurpose>Planar spatial data type.</refpurpose>
+ </refnamediv>
+
+ <refsection>
+ <title>Description</title>
+ <para>GEOMETRY is a fundamental postgis spatial data type used to represent a feature in the Euclidean coordinate system.</para>
+ </refsection>
+
+ <refsection>
+ <title>See Also</title>
+ <para><xref linkend="RefObject" /></para>
+ </refsection>
+ </refentry>
+
+ <refentry id="geography">
+ <refnamediv>
+ <refname>GEOGRAPHY</refname>
+ <refpurpose>Ellipsoidal spatial data type.</refpurpose>
+ </refnamediv>
+
+ <refsection>
+ <title>Description</title>
+ <para>GEOGRAPHY is a spatial data type used to represent a feature in the round-earth coordinate system.</para>
+ </refsection>
+
+ <refsection>
+ <title>See Also</title>
+ <para><xref linkend="PostGIS_GeographyFunctions" />,<xref linkend="PostGIS_Geography" /></para>
+ </refsection>
+ </refentry>
+ </sect1>