79 lines
1.9 KiB
Plaintext
79 lines
1.9 KiB
Plaintext
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<sect1 id="dict-xsyn">
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<title>dict_xsyn</title>
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<indexterm zone="dict-xsyn">
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<primary>dict_xsyn</primary>
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</indexterm>
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<para>
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The Extended Synonym Dictionary module replaces words with groups of their
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synonyms, and so makes it possible to search for a word using any of its
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synonyms.
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</para>
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<sect2>
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<title>Configuration</title>
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<para>
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A <literal>dict_xsyn</> dictionary accepts the following options:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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KEEPORIG controls whether the original word is included, or only its
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synonyms. Default is 'true'.
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</para>
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</listitem>
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<listitem>
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<para>
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RULES is the base name of the file containing the list of synonyms.
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This file must be in $(prefix)/share/tsearch_data/, and its name must
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end in ".rules" (which is not included in the RULES parameter).
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</para>
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</listitem>
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</itemizedlist>
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<para>
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The rules file has the following format:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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Each line represents a group of synonyms for a single word, which is
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given first on the line. Synonyms are separated by whitespace:
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</para>
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<programlisting>
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word syn1 syn2 syn3
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</programlisting>
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</listitem>
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<listitem>
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<para>
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Sharp ('#') sign is a comment delimiter. It may appear at any position
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inside the line. The rest of the line will be skipped.
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</para>
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</listitem>
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</itemizedlist>
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<para>
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Look at xsyn_sample.rules, which is installed in $(prefix)/share/tsearch_data/,
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for an example.
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</para>
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</sect2>
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<sect2>
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<title>Usage</title>
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<programlisting>
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mydb=# SELECT ts_lexize('xsyn','word');
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ts_lexize
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----------------
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{word,syn1,syn2,syn3)
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</programlisting>
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<para>
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Change dictionary options:
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</para>
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<programlisting>
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mydb# ALTER TEXT SEARCH DICTIONARY xsyn (KEEPORIG=false);
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ALTER TEXT SEARCH DICTIONARY
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</programlisting>
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</sect2>
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</sect1>
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