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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
  <head>
	<title>
	  ht://Dig: htfuzzy
	</title>
  </head>
  <body bgcolor="#eef7ff">
	<h1>
	  htfuzzy
	</h1>
	<p>
	  ht://Dig Copyright &copy; 1995-2004 <a href="THANKS.html">The ht://Dig Group</a><br>
	  Please see the file <a href="COPYING">COPYING</a> for
	  license information.
	</p>
	<hr size="4" noshade>
	<dl>
	  <dd>
		<h2>
		  Synopsis
		</h2>
	  </dd>
	  <dd>
		htfuzzy [-c <em>configfile</em>][-v] <em>algorithm</em> ...
	  </dd>
	</dl>
	<dl>
	  <dd>
		<h2>
		  Description
		</h2>
	  </dd>
	  <dd>
		Htfuzzy creates indexes for different "fuzzy" search
		algorithms. These indexes can then be used by the
		<a href="htsearch.html" target="_top">htsearch</a> program.
	  </dd>
	</dl>
	<dl>
	  <dd>
		<h2>
		  Options
		</h2>
	  </dd>
	  <dd>
		<dl compact>
		  <dt>
			-c <em>configfile</em>
		  </dt>
		  <dd>
			Use the specified configuration file instead of the
			default.
		  </dd>
		  <dt>
			-v
		  </dt>
		  <dd>
			Verbose mode. Used once will provide progress feedback,
			used more than once will overflow even the biggest
			buffers. :-)
		  </dd>
		</dl>
	  </dd>
	</dl>
	<dl>
	  <dd>
		<h2>
		  Algorithms
		</h2>
	  </dd>
	  <dd>
		Indexes for the following search algorithms can currently
		be created: 
		<dl>
		  <dt>
			<strong>soundex</strong>
		  </dt>
		  <dd>
			Creates a slightly modified  <a href="http://www.sog.org.uk/cig/vol6/605tdrake.pdf">soundex</a> key database.
			A soundex key encodes letters as digits, with similar
			sounding letters (c, k, q) given the same digit.  Vowels
			are not coded.
			Differences with the standard soundex algorithm are: 
			<ul>
			  <li>
				Keys are 6 digits.
			  </li>
			  <li>
				The first letter is also encoded.
			  </li>
			</ul>
		  </dd>
		  <dt>
			<strong>metaphone</strong>
		  </dt>
		  <dd>
			Creates a metaphone key database. This algorithm is
			more specific to English, but will get fewer "weird"
			matches than the soundex algorithm.
		  </dd>
		  <dt>
			<strong>accents</strong>
		  </dt>
		  <dd>
			Creates an accents key database. This algorithm will
			map all accented letters to their unaccented
			counterparts, so that a search for the unaccented
			word will yield all variations of this word with
			accents.
		  </dd>
		  <dt>
			<strong>endings</strong>
		  </dt>
		  <dd>
			Creates two databases which can be used to match common
			word endings. The creation of these databases requires
			a list of affix rules and a dictionary which uses those
			affix rules. The format of the affix rules and
			dictionary files are the ones used by the
			<a href="http://fmg-www.cs.ucla.edu/fmg-members/geoff/ispell.html">
			ispell</a> program. Included with the distribution are
			the affix rules for English and a fairly small English
			dictionary. Other languages can be supported by getting
			the appropriate affix rules and dictionaries. These are
			available for many languages; check the ispell
			distribution for more details.
		  </dd>
		  <dt>
			<strong>synonyms</strong>
		  </dt>
		  <dd>
			Creates a database of synonyms for words. It reads a
			text database of synonyms and creates a database that
			htsearch can then use. Each line of the text database
			consists of words where the first word will have the
			other words on that line as synonyms.
		  </dd>
		</dl>
	  </dd>
	</dl>
	<dl>
	  <dd>
		<h2>
		  Files
		</h2>
	  </dd>
	  <dd>
		<dl>
		  <dt>
			<a href="attrs.html#config_dir">CONFIG_DIR</a>/htdig.conf
		  </dt>
		  <dd>
			The default configuration file.
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#database_dir">DATABASE_DIR</a>/db.accents.db
		  </dt>
		  <dd>
			(Output) Maps between characters with and without
			accents for accents fuzzy rule
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#database_dir">DATABASE_DIR</a>/db.metaphone.db
		  </dt>
		  <dd>
			(Output) Database of similar-sounding words for
			metaphone fuzzy rule
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#database_dir">DATABASE_DIR</a>/db.soundex.db
		  </dt>
		  <dd>
			(Output) Database of similar-sounding words for soundex
			fuzzy rule
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#common_dir">COMMON_DIR</a>/english.0, <a href="attrs.html#common_dir">COMMON_DIR</a>/english.aff
		  </dt>
		  <dd>
			(Input) List of words and affix rules used to generate
			endings
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#common_dir">COMMON_DIR</a>/root2word.db, <a href="attrs.html#common_dir">COMMON_DIR</a>/word2rood.db
		  </dt>
		  <dd>
			(Output) Database used for endings fuzzy rule
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#common_dir">COMMON_DIR</a>/synonyms
		  </dt>
		  <dd>
			(Input) List of groups of words considered synonymous
		  </dd>
		</dl>
		<dl>
		  <dt>
			<a href="attrs.html#common_dir">COMMON_DIR</a>/synonyms.db
		  </dt>
		  <dd>
			(Output) Database used for synonyms fuzzy rule
		  </dd>
		</dl>
	  </dd>
	</dl>
	<dl>
	  <dd>
		<h2>
		  See Also
		</h2>
	  </dd>
	  <dd>
		<a href="htdig.html">htdig</a>,
		<a href="htmerge.html">htmerge</a>,
		<a href="htsearch.html" target="_top">htsearch</a>,
		<a href="attrs.html">Configuration file format</a>, and
		<a href="http://fmg-www.cs.ucla.edu/fmg-members/geoff/ispell.html">
		ispell</a>.
	  </dd>
	</dl>
	<hr size="4" noshade>

	Last modified: $Date: 2004/06/12 13:39:13 $

  </body>
</html>