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>53.4. Examples</A
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><P
>  The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> source distribution includes
  several examples of index methods implemented using
  <ACRONYM
CLASS="ACRONYM"
>GiST</ACRONYM
>.  The core system currently provides text search
  support (indexing for <TT
CLASS="TYPE"
>tsvector</TT
> and <TT
CLASS="TYPE"
>tsquery</TT
>) as well as
  R-Tree equivalent functionality for some of the built-in geometric data types
  (see <TT
CLASS="FILENAME"
>src/backend/access/gist/gistproc.c</TT
>).  The following
  <TT
CLASS="FILENAME"
>contrib</TT
> modules also contain <ACRONYM
CLASS="ACRONYM"
>GiST</ACRONYM
>
  operator classes:

 <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="FILENAME"
>btree_gist</TT
></DT
><DD
><P
>B-tree equivalent functionality for several data types</P
></DD
><DT
><TT
CLASS="FILENAME"
>cube</TT
></DT
><DD
><P
>Indexing for multidimensional cubes</P
></DD
><DT
><TT
CLASS="FILENAME"
>hstore</TT
></DT
><DD
><P
>Module for storing (key, value) pairs</P
></DD
><DT
><TT
CLASS="FILENAME"
>intarray</TT
></DT
><DD
><P
>RD-Tree for one-dimensional array of int4 values</P
></DD
><DT
><TT
CLASS="FILENAME"
>ltree</TT
></DT
><DD
><P
>Indexing for tree-like structures</P
></DD
><DT
><TT
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>pg_trgm</TT
></DT
><DD
><P
>Text similarity using trigram matching</P
></DD
><DT
><TT
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>seg</TT
></DT
><DD
><P
>Indexing for <SPAN
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>"float ranges"</SPAN
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