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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>F.12. dict_xsyn</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="dict-int.html" title="F.11. dict_int" /><link rel="next" href="earthdistance.html" title="F.13. earthdistance" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.12. dict_xsyn</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="dict-int.html" title="F.11. dict_int">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="earthdistance.html" title="F.13. earthdistance">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="DICT-XSYN"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.12. dict_xsyn</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.21.4">F.12.1. Configuration</a></span></dt><dt><span class="sect2"><a href="dict-xsyn.html#id-1.11.7.21.5">F.12.2. Usage</a></span></dt></dl></div><a id="id-1.11.7.21.2" class="indexterm"></a><p>

  3.   <code class="filename">dict_xsyn</code> (Extended Synonym Dictionary) is an example of an

  4.   add-on dictionary template for full-text search.  This dictionary type

  5.   replaces words with groups of their synonyms, and so makes it possible to

  6.   search for a word using any of its synonyms.

  7.  </p><div class="sect2" id="id-1.11.7.21.4"><div class="titlepage"><div><div><h3 class="title">F.12.1. Configuration</h3></div></div></div><p>

  8.    A <code class="literal">dict_xsyn</code> dictionary accepts the following options:

  9.   </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>

  10.      <code class="literal">matchorig</code> controls whether the original word is accepted by

  11.      the dictionary. Default is <code class="literal">true</code>.

  12.     </p></li><li class="listitem"><p>

  13.      <code class="literal">matchsynonyms</code> controls whether the synonyms are

  14.      accepted by the dictionary. Default is <code class="literal">false</code>.

  15.     </p></li><li class="listitem"><p>

  16.      <code class="literal">keeporig</code> controls whether the original word is included in

  17.      the dictionary's output. Default is <code class="literal">true</code>.

  18.     </p></li><li class="listitem"><p>

  19.      <code class="literal">keepsynonyms</code> controls whether the synonyms are included in

  20.      the dictionary's output. Default is <code class="literal">true</code>.

  21.     </p></li><li class="listitem"><p>

  22.      <code class="literal">rules</code> is the base name of the file containing the list of

  23.      synonyms.  This file must be stored in

  24.      <code class="filename">$SHAREDIR/tsearch_data/</code> (where <code class="literal">$SHAREDIR</code> means

  25.      the <span class="productname">PostgreSQL</span> installation's shared-data directory).

  26.      Its name must end in <code class="literal">.rules</code> (which is not to be included in

  27.      the <code class="literal">rules</code> parameter).

  28.     </p></li></ul></div><p>

  29.    The rules file has the following format:

  30.   </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>

  31.      Each line represents a group of synonyms for a single word, which is

  32.      given first on the line. Synonyms are separated by whitespace, thus:

  33. </p><pre class="programlisting">

  34. word syn1 syn2 syn3

  35. </pre><p>

  36.     </p></li><li class="listitem"><p>

  37.      The sharp (<code class="literal">#</code>) sign is a comment delimiter. It may appear at

  38.      any position in a line.  The rest of the line will be skipped.

  39.     </p></li></ul></div><p>

  40.    Look at <code class="filename">xsyn_sample.rules</code>, which is installed in

  41.    <code class="filename">$SHAREDIR/tsearch_data/</code>, for an example.

  42.   </p></div><div class="sect2" id="id-1.11.7.21.5"><div class="titlepage"><div><div><h3 class="title">F.12.2. Usage</h3></div></div></div><p>

  43.    Installing the <code class="literal">dict_xsyn</code> extension creates a text search

  44.    template <code class="literal">xsyn_template</code> and a dictionary <code class="literal">xsyn</code>

  45.    based on it, with default parameters.  You can alter the

  46.    parameters, for example

  47. 

  48. </p><pre class="programlisting">

  49. mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=false);

  50. ALTER TEXT SEARCH DICTIONARY

  51. </pre><p>

  52. 

  53.    or create new dictionaries based on the template.

  54.   </p><p>

  55.    To test the dictionary, you can try

  56. 

  57. </p><pre class="programlisting">

  58. mydb=# SELECT ts_lexize('xsyn', 'word');

  59.       ts_lexize

  60. -----------------------

  61.  {syn1,syn2,syn3}

  62. 

  63. mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=true);

  64. ALTER TEXT SEARCH DICTIONARY

  65. 

  66. mydb=# SELECT ts_lexize('xsyn', 'word');

  67.       ts_lexize

  68. -----------------------

  69.  {word,syn1,syn2,syn3}

  70. 

  71. mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=false, MATCHSYNONYMS=true);

  72. ALTER TEXT SEARCH DICTIONARY

  73. 

  74. mydb=# SELECT ts_lexize('xsyn', 'syn1');

  75.       ts_lexize

  76. -----------------------

  77.  {syn1,syn2,syn3}

  78. 

  79. mydb# ALTER TEXT SEARCH DICTIONARY xsyn (RULES='my_rules', KEEPORIG=true, MATCHORIG=false, KEEPSYNONYMS=false);

  80. ALTER TEXT SEARCH DICTIONARY

  81. 

  82. mydb=# SELECT ts_lexize('xsyn', 'syn1');

  83.       ts_lexize

  84. -----------------------

  85.  {word}

  86. </pre><p>

  87. 

  88.    Real-world usage will involve including it in a text search

  89.    configuration as described in <a class="xref" href="textsearch.html" title="Chapter 12. Full Text Search">Chapter 12</a>.

  90.    That might look like this:

  91. 

  92. </p><pre class="programlisting">

  93. ALTER TEXT SEARCH CONFIGURATION english

  94.     ALTER MAPPING FOR word, asciiword WITH xsyn, english_stem;

  95. </pre><p>

  96. 

  97.   </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="dict-int.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="earthdistance.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">F.11. dict_int </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> F.13. earthdistance</td></tr></table></div></body></html>
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