<refnamediv>
<refname>ST_CollectionExtract</refname>
- <refpurpose>Given a GEOMETRYCOLLECTION, returns the a MULTI* geometry consisting only the specified type. Sub-geometries that are not
+ <refpurpose>Given a GEOMETRYCOLLECTION, returns a MULTI* geometry consisting only of the specified type. Sub-geometries that are not
the specified type are ignored. If there are no sub-geometries of the right type, an EMPTY collection will be returned. Only
points, lines and polygons are supported. Type numbers are 1 == POINT, 2 == LINESTRING, 3 == POLYGON.</refpurpose>
</refnamediv>
<refsection>
<title>Description</title>
- <para>Given a GEOMETRYCOLLECTION, returns the a MULTI* geometry consisting only the specified type. Sub-geometries that are not
+ <para>Given a GEOMETRYCOLLECTION, returns a MULTI* geometry consisting only of the specified type. Sub-geometries that are not
the specified type are ignored. If there are no sub-geometries of the right type, an EMPTY collection will be returned. Only
points, lines and polygons are supported. Type numbers are 1 == POINT, 2 == LINESTRING, 3 == POLYGON.</para>