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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>Recoll Index format</title>

    <meta name="generator" content="HTML Tidy, see www.w3.org">

    <meta name="Author" content="Jean-Francois Dockes">

    <meta name="Description" content=

    "recoll est un logiciel personnel de recherche textuelle pour unix et linux basé sur Xapian, un moteur d'indexation puissant et mature.">

    <meta name="Keywords" content=

      "recherche textuelle,desktop,unix,linux,solaris,open source,free">

    <meta http-equiv="Content-language" content="fr">

    <meta http-equiv="content-type" content=

    "text/html; charset=iso-8859-1">

    <meta name="robots" content="All,Index,Follow">

    <link type="text/css" rel="stylesheet" href="styles/style.css">

  </head>



  <body>

    <div class="content">

    <h1>Recoll index format details</h1>



    <p>A comparison of index formats for recoll 1.17 and omega

      1.0.1</p>



    <p>Recoll terms are not stemmed before being stored. They are turned to

      all minuscule letters with no accents. An auxiliary database

      handles stem expansion. Omega stores both raw

      terms (with prefix R) and stemmed versions (with prefix Z).

      The xapian-side of the information here comes from the relevant

      xapian-omega <a

      href="http://xapian.org/docs/omega/termprefixes.html">documentation

      page</a>. 

    </p>



    <h2>Special prefixed terms:</h2>



    <p>A comparison of prefixed term usage between Recoll and

      omega/xapian.</p>



    <table border=1 cellspacing=0 width="90%">

	<thead>

	<tr><th>Pref.</th><th>Recoll use</th><th>Omega use</th>

	</tr>

      </thead>

      <tbody>

	<tr><td>A</td><td>Author</td><td>Same</td></tr>



	<tr><td>B</td><td>Unused</td><td>Reserved</td></tr>

	<tr><td>C</td><td>Unused</td><td>Reserved</td></tr>



	<tr><td>D</td><td>date: modification date of file, like

	    YYYYMMDD</td><td>Same</td></tr>



        <tr><td>E</td><td>Unused. Recoll uses XE</td>

          <td>file name extension folded to lowercase</td></tr>





	<tr><td>F</td><td>Unused</td><td>Reserved</td></tr>

	<tr><td>G</td><td>Unused</td><td>newGroup / forum name</td></tr>



	<tr><td>H</td><td>Unused</td><td>host name</td></tr>



	<tr><td>I</td><td>Unused</td><td>"Can see"</td></tr>



	<tr><td>J</td><td>Unused</td><td>Reserved</td></tr>

	<tr><td>K</td><td>Keyword</td><td>Same</td></tr>



	<tr><td>L</td><td>Unused</td><td>ISO language code</td></tr>



	<tr><td>M</td><td>month: YYYYMM</td><td>Same</td></tr>



	<tr><td>N</td><td>Unused</td><td>ISO country code</td></tr>



	<tr><td>O</td><td>Unused</td><td>Owner</td></tr>



	<tr><td>P</td><td>Unused</td><td>Path part of URL</td></tr>



	<tr><td>Q</td><td>Unique Id. fs backend: trunc-hashed path+ipath

	    Other backends may use a different unique id.

	  </td><td>Unique Id</td></tr>



	<tr><td>R</td><td>Unused</td><td>Raw (unstemmed) term</td></tr>



	<tr><td>S</td><td>Subject/title</td><td>Same</td></tr>



	<tr><td>T</td><td>mime type</td><td>Same</td></tr>



	<tr><td>U</td><td>Unused</td><td>Full Url of indexed

	    document. Truncated/hashed version of URL. Used for

	    duplicate checks.</td></tr> 



	<tr><td>V</td><td>Unused</td><td>"Can't see"</td></tr>



	<tr><td>W</td><td>Unused</td><td>Owner</td></tr>



	<tr><td>X</td><td>Prefix prefix for multichar prefixes</td>

          <td>Same</td></tr>



	<tr><td>Y</td><td>year YYYY</td><td>Same</td></tr>



	<tr><td>Z</td><td>Unused</td><td>Stemmed term</td></tr>



        <tr><td>XE</td><td>File name extension folded as lowercase

            (omega uses E)</td><td>Unused</td></tr>



        <tr><td>XP</td><td>Path elements (for phrase-based directory filtering)

          </td><td>Unused</td></tr>



	<tr><td>XSFN</td><td>utf8 lowercased/unaccented version of

	    file name. Used for specific file name searches. NOT SPLIT

	    (spaces as normal chars).</td><td>None</td>



	<tr><td>XTO</td><td>Recipient</td><td>None</td>

	<tr><td>XXST</td><td>Not really a prefix: start of field

	    marker (for anchored phrase searches)</td><td>None</td>

	<tr><td>XXND</td><td>Not really a prefix: end of field

	    marker (for anchored phrase searches)</td><td>None</td>



	</tr>



	

      </tbody>

    </table>





    <h2>Values</h2>



    <table border=1 cellspacing=0 width="90%">

	<thead>

	<tr><th>Value slot</th><th>Recoll use</th><th>Omega use</th>

	</tr>

      </thead>

      <tbody>

	<tr><td>0</td><td>Unused</td><td>Unix modification time</td></tr>

	<tr><td>1</td><td>MD5</td><td>Same</td></tr>

	<tr><td>2</td><td>Unused</td><td>Size</td></tr>

	<tr><td>10</td><td>Signature: value to be checked for

	    up-to-dateness, ie mtime|size for the fs

	    backend</td><td>Unused</td></tr> 

      </tbody>

    </table>





    <h2>Document data record format</h2>



      <p>Recoll has the same line based / prefixed data record format

      as omega (name=value\n). The Omega data below is quite out of

      date.</p>



    <table border=1 cellspacing=0 width="90%">

	<thead>

	<tr><th>Prefix</th><th>Recoll use</th><th>Omega use</th>

	</tr>

      </thead>

      <tbody>

	

      <tr><td>url=</td><td>Full url. Always file://abspath. The path is not

	encoded to utf-8, this is the system file name ,usable as an

	argument to open()</td><td>Same</td>

	</tr>



	<tr><td>mtype=</td><td>mime type (omega: type)</td><td>type=</td>

	</tr>

	<tr><td>fmtime=</td><td>file modification date</td><td>modtime=</td>

	</tr>

	<tr><td>dmtime=</td><td> document modification date</td><td>None</td>

	</tr>

	<tr><td>origcharset=</td><td> character set the text was

	    converted from</td><td>None</td>

	</tr>

	<tr><td>fbytes=</td><td> file size in bytes</td><td>size=</td>

	</tr>

	<tr><td>dbytes=</td><td>document size in bytes</td><td>None</td>

	</tr>

	<tr><td>ipath=</td><td>internal path for docs in multidoc

	    files</td><td>None</td>

	</tr>



	<tr><td>caption=</td><td>title of document, utf8</td><td>Same</td>

	</tr>

	<tr><td>keywords=</td><td>key words, utf8</td><td>None</td>

	</tr>

	<tr><td>abstract=</td><td>document abstract, utf8</td><td>sample=</td>

	</tr>

      </tbody>

    </table>

    </div>



    <hr>

    <address><a href="mailto:jfd@recoll.org">Jean-Francois Dockes</a></address>

<!-- Created: Thu Dec  7 13:07:40 CET 2006 -->

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Last modified: Sat Feb 25 09:14:38 CEST 2012

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  </body>

</html>