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-<!doctype article PUBLIC "-//Davenport//DTD DocBook V3.0//EN" [
-<!entity Evolution "<application>Evolution</application>">
-<!entity Camel "Camel">
-<!entity Ibex "Ibex">
-]>
-
-<article class="whitepaper" id="ibex">
-
-  <artheader>
-    <title>Ibex: an Indexing System</title>
-
-    <authorgroup>
-      <author>
-	<firstname>Dan</firstname>
-	<surname>Winship</surname>
-	<affiliation>
-	  <address>
-	    <email>danw@helixcode.com</email>
-	  </address>
-	</affiliation>
-      </author>
-    </authorgroup>
-
-    <copyright>
-      <year>2000</year>
-      <holder>Helix Code, Inc.</holder>
-    </copyright>
-
-  </artheader>
-
-  <sect1 id="introduction">
-    <title>Introduction</title>
-
-    <para>
-      &Ibex; is a library for text indexing. It is being used by
-      &Camel; to allow it to quickly search locally-stored messages,
-      either because the user is looking for a specific piece of text,
-      or because the application is contructing a vFolder or filtering
-      incoming mail.
-    </para>
-  </sect1>
-
-  <sect1 id="goals">
-    <title>Design Goals and Requirements for Ibex</title>
-
-    <para>
-      The design of &Ibex; is based on a number of requirements.
-
-    <itemizedlist>
-      <listitem>
-        <para>
-	  First, obviously, it must be fast. In particular, searching
-	  the index must be appreciably faster than searching through
-	  the messages themselves, and constructing and maintaining
-	  the index must not take a noticeable amount of time.
-	</para>
-      </listitem>
-
-      <listitem>
-        <para>
-	  The indexes must not take up too much space. Many users have
-	  limited filesystem quotas on the systems where they read
-	  their mail, and even users who read mail on private machines
-	  have to worry about running out of space on their disks. The
-	  indexes should be able to do their job without taking up so
-	  much space that the user decides he would be better off
-	  without them.
-	</para>
-
-	<para>
-	  Another aspect of this problem is that the system as a whole
-	  must be clever about what it does and does not index:
-	  accidentally indexing a "text" mail message containing
-	  uuencoded, BinHexed, or PGP-encrypted data will drastically
-	  affect the size of the index file. Either the caller or the
-	  indexer itself has to avoid trying to index these sorts of
-	  things.
-	</para>
-      </listitem>
-
-      <listitem>
-        <para>
-	  The indexing system must allow data to be added to the index
-	  incrementally, so that new messages can be added to the
-	  index (and deleted messages can be removed from it) without
-	  having to re-scan all existing messages.
-	</para>
-      </listitem>
-
-      <listitem>
-        <para>
-	  It must allow the calling application to explain the
-	  structure of the data however it wants to, rather than
-	  requiring that the unit of indexing be individual files.
-	  This way, &Camel; can index a single mbox-format file and
-	  treat it as multiple messages.
-	</para>
-      </listitem>
-
-      <listitem>
-        <para>
-	  It must support non-ASCII text, given that many people send
-	  and receive non-English email, and even people who only
-	  speak English may receive email from people whose names
-	  cannot be written in the US-ASCII character set.
-	</para>
-      </listitem>
-    </itemizedlist>
-
-    <para>
-      While there are a number of existing indexing systems, none of
-      them met all (or even most) of our requirements.
-    </para>
-  </sect1>
-
-  <sect1 id="implementation">
-    <title>The Implementation</title>
-
-    <para>
-      &Ibex; is still young, and many of the details of the current
-      implementation are not yet finalized.
-    </para>
-
-    <para>
-      With the current index file format, 13 megabytes of Info files
-      can be indexed into a 371 kilobyte index file&mdash;a bit under
-      3% of the original size. This is reasonable, but making it
-      smaller would be nice. (The file format includes some simple
-      compression, but <application>gzip</application> can compress an
-      index file to about half its size, so we can clearly do better.)
-    </para>
-
-    <para>
-      The implementation has been profiled and optimized for speed to
-      some degree. But, it has so far only been run on a 500MHz
-      Pentium III system with very fast disks, so we have no solid
-      benchmarks.
-    </para>
-
-    <para>
-      Further optimization (of both the file format and the in-memory
-      data structures) awaits seeing how the library is most easily
-      used by &Evolution;: if the indexes are likely to be kept in
-      memory for long periods of time, the in-memory data structures
-      need to be kept small, but the reading and writing operations
-      can be slow. On the other hand, if the indexes will only be
-      opened when they are needed, reading and writing must be fast,
-      and memory usage is less critical.
-    </para>
-
-    <para>
-      Of course, to be useful for other applications that have
-      indexing needs, the library should provide several options, so
-      that each application can use the library in the way that is
-      most suited for its needs.
-    </para>
-  </sect1>
-</article>