Extended Synonym dictionary
===========================
This is a simple synonym dictionary. It replaces words with groups of their
synonyms, and so makes it possible to search for a word using any of its
synonyms.
* Configuration
It accepts the following options:
- KEEPORIG controls whether the original word is included, or only its
synonyms. Default is 'true'.
- RULES is the base name of the file containing the list of synonyms.
This file must be in $(prefix)/share/tsearch_data/, and its name must
end in ".rules" (which is not included in the RULES parameter).
The rules file has the following format:
- Each line represents a group of synonyms for a single word, which is
given first on the line. Synonyms are separated by whitespace:
word syn1 syn2 syn3
- Sharp ('#') sign is a comment delimiter. It may appear at any position
inside the line. The rest of the line will be skipped.
Look at xsyn_sample.rules, which is installed in $(prefix)/share/tsearch_data/,
for an example.
* Usage
1. Compile and install
2. Load dictionary
psql mydb < dict_xsyn.sql
3. Test it
mydb=# SELECT ts_lexize('xsyn','word');
ts_lexize
----------------
{word,syn1,syn2,syn3)
4. Change the dictionary options as you wish
mydb# ALTER TEXT SEARCH DICTIONARY xsyn (KEEPORIG=false);
ALTER TEXT SEARCH DICTIONARY
That's all.
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