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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html> <head>
<meta http-equiv='CONTENT-TYPE' content='text/html; charset=UTF-8' />
<link rel='StyleSheet' href='DTDDocStyle.css' type='text/css' media='screen' />
<title>Contrib Lucene</title>
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<p class='DTDSource'><b><code>LuceneContribQuery.dtd</code></b>: <a href='LuceneContribQuery.dtd.html'>Elements</a> - <a href='LuceneContribQuery.dtd.entities.html'>Entities</a> - <a href='LuceneContribQuery.dtd.org.html'>Source</a> | <a href='intro.html'>Intro</a> - <a href='elementsIndex.html'>Index</a><br /><a href='index.html' target='_top'>FRAMES</a>&nbsp;/&nbsp;<a href='LuceneContribQuery.dtd.org.html' target='_top'>NO FRAMES</a></p><pre id='dtd_source'><span class="dtd_comment">&lt;!-- </span>
<span class="dtd_comment"> This DTD builds on the &lt;a href=&quot;LuceneCoreQuery.dtd.html&quot;&gt;core Lucene XML syntax&lt;/a&gt; and adds support for features found in the &quot;contrib&quot; section of the Lucene project.</span>
<span class="dtd_comment"> </span>
<span class="dtd_comment"> CorePlusExtensionsParser.java is the Java class that encapsulates this parser behaviour.</span>
<span class="dtd_comment"> </span>
<span class="dtd_comment"> The features added are:</span>
<span class="dtd_comment"> &lt;ul&gt;</span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#LikeThisQuery&quot;&gt;LikeThisQuery&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> Support for querying using large amounts of example text indicative of the users' general area of interest</span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#FuzzyLikeThisQuery&quot;&gt;FuzzyLikeThisQuery&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> A style of fuzzy query which automatically looks for fuzzy variations on only the &quot;interesting&quot; terms </span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#BooleanFilter&quot;&gt;BooleanFilter&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> Is to Filters what core Lucene's BooleanQuery is to Queries - allows mixing of clauses using Boolean logic</span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#TermsFilter&quot;&gt;TermsFilter&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> Constructs a filter from an arbitrary set of terms (unlike &lt;a href=&quot;#RangeFilter&quot;&gt;RangeFilter&lt;/a&gt; which requires a contiguous range of terms)</span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#DuplicateFilter&quot;&gt;DuplicateFilter&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> Removes duplicated documents from results where &quot;duplicate&quot; means documents share a value for a particular field (e.g. a primary key)</span>
<span class="dtd_comment"> &lt;li&gt;&lt;a href=&quot;#BoostingQuery&quot;&gt;BoostingQuery&lt;/a&gt;&lt;/li&gt;</span>
<span class="dtd_comment"> Influence score of a query's matches in a subtle way which can't be achieved using BooleanQuery</span>
<span class="dtd_comment"> &lt;/ul&gt;</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@title</span><span class="dtd_comment"> Contrib Lucene</span>
<span class="dtd_comment">--&gt;</span>
<span class="dtd_comment">&lt;!-- </span><span class="dtd_dtddoc_tag">@hidden</span><span class="dtd_comment"> include the core DTD --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">coreParserDTD</span><span class="dtd_plain"> </span><span class="dtd_keyword">SYSTEM</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;LuceneCoreQuery.dtd&quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- </span><span class="dtd_dtddoc_tag">@hidden</span><span class="dtd_comment"> Allow for extensions --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">extendedSpanQueries2</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot; &quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">extendedQueries2</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot; &quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">extendedFilters2</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot; &quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">extendedQueries1</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;|LikeThisQuery|BoostingQuery|FuzzyLikeThisQuery%extendedQueries2;%extendedSpanQueries2;&quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ENTITY</span><span class="dtd_plain"> % </span><span class="dtd_attribute_name">extendedFilters1</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;|TermsFilter|BooleanFilter|DuplicateFilter%extendedFilters2;&quot;</span><span class="dtd_plain"> </span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_plain">%coreParserDTD;</span>
<span class="dtd_comment">&lt;!--</span>
<span class="dtd_comment">Performs fuzzy matching on &quot;significant&quot; terms in fields. Improves on &quot;LikeThisQuery&quot; by allowing for fuzzy variations of supplied fields.</span>
<span class="dtd_comment">Improves on FuzzyQuery by rewarding all fuzzy variants of a term with the same IDF rather than default fuzzy behaviour which ranks rarer</span>
<span class="dtd_comment"> variants (typically misspellings) more highly. This can be a useful default search mode for processing user input where the end user</span>
<span class="dtd_comment"> is not expected to know about the standard query operators for fuzzy, boolean or phrase logic found in UserQuery</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> </span>
<span class="dtd_comment"> &lt;em&gt;Search for information about the Sumitomo bank, where the end user has mis-spelt the name&lt;/em&gt;</span>
<span class="dtd_comment"> % </span>
<span class="dtd_comment"> &lt;FuzzyLikeThisQuery&gt;</span>
<span class="dtd_comment"> &lt;Field fieldName=&quot;contents&quot;&gt;</span>
<span class="dtd_comment"> Sumitimo bank</span>
<span class="dtd_comment"> &lt;/Field&gt;</span>
<span class="dtd_comment"> &lt;/FuzzyLikeThisQuery&gt;</span>
<span class="dtd_comment"> % </span>
<span class="dtd_comment">--&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">FuzzyLikeThisQuery</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">Field</span><span class="dtd_plain">)*</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Optional boost for matches on this query. Values &gt; 1 --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">FuzzyLikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">boost</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1.0&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Limits the total number of terms selected from the provided text plus the selected &quot;fuzzy&quot; variants --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">FuzzyLikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">maxNumTerms</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;50&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Ignore &quot;Term Frequency&quot; - a boost factor which rewards multiple occurences of the same term in a document --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">FuzzyLikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">ignoreTF</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">true</span><span class="dtd_plain">|</span><span class="dtd_attribute_name">false</span><span class="dtd_plain">) </span><span class="dtd_attribute_value">&quot;false&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- A field used in a FuzzyLikeThisQuery --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">Field</span><span class="dtd_plain"> (</span><span class="dtd_keyword">#PCDATA</span><span class="dtd_plain">)</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Controls the level of similarity required for fuzzy variants where 1 is identical and 0.5 is that the variant contains </span>
<span class="dtd_comment"> half of the original's characters in the same order. Lower values produce more results but may take longer to execute due to</span>
<span class="dtd_comment"> additional IO required to read matching document ids--&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">Field</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">minSimilarity</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;0.5&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Controls the minimum number of characters at the start of fuzzy variant words that must exactly match the original.</span>
<span class="dtd_comment"> A value of zero will require no minimum and the search software will effectively scan ALL terms from a to z looking for variations.</span>
<span class="dtd_comment"> This can incur high CPU overhead and a prefix length of just &quot;1&quot; will reduce this overhead to 1/26th of the original cost (assuming</span>
<span class="dtd_comment"> an even distribution of letters used from the alphabet).</span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">Field</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">prefixLength</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- fieldName must be defined here or is taken from the most immediate parent XML element that defines a &quot;fieldName&quot; attribute --&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">Field</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">fieldName</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_keyword">#IMPLIED</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!--</span>
<span class="dtd_comment"> Cherry-picks &quot;significant&quot; terms from the example child text and queries using these words. By only using significant (read: rare) terms the</span>
<span class="dtd_comment"> performance cost of the query is substantially reduced and large bodies of text can be used as example content.</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> </span>
<span class="dtd_comment"> &lt;em&gt;Use a block of text as an example of the type of content to be found, ignoring the &quot;Reuters&quot; word which</span>
<span class="dtd_comment"> appears commonly in the index.&lt;/em&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> &lt;LikeThisQuery percentTermsToMatch=&quot;5&quot; stopWords=&quot;Reuters&quot;&gt;</span>
<span class="dtd_comment"> IRAQI TROOPS REPORTED PUSHING BACK IRANIANS Iraq said today its troops were pushing Iranian forces out of </span>
<span class="dtd_comment"> positions they had initially occupied when they launched a new offensive near the southern port of </span>
<span class="dtd_comment"> Basra early yesterday. A High Command communique said Iraqi troops had won a significant victory </span>
<span class="dtd_comment"> and were continuing to advance. Iraq said it had foiled a three-pronged thrust some 10 km </span>
<span class="dtd_comment"> (six miles) from Basra, but admitted the Iranians had occupied ground held by the Mohammed al-Qassem </span>
<span class="dtd_comment"> unit, one of three divisions attacked. The communique said Iranian Revolutionary Guards were under </span>
<span class="dtd_comment"> assault from warplanes, helicopter gunships, heavy artillery and tanks. &quot;Our forces are continuing </span>
<span class="dtd_comment"> their advance until they purge the last foothold&quot; occupied by the Iranians, it said. </span>
<span class="dtd_comment"> (Iran said its troops had killed or wounded more than 4,000 Iraqis and were stabilising their new positions.) </span>
<span class="dtd_comment"> The Baghdad communique said Iraqi planes also destroyed oil installations at Iran's southwestern Ahvaz field </span>
<span class="dtd_comment"> during a raid today. It denied an Iranian report that an Iraqi jet was shot down. </span>
<span class="dtd_comment"> Iraq also reported a naval battle at the northern tip of the Gulf. Iraqi naval units and forces defending an </span>
<span class="dtd_comment"> offshore terminal sank six Iranian out of 28 Iranian boats attempting to attack an offshore terminal, </span>
<span class="dtd_comment"> the communique said. Reuters 3;</span>
<span class="dtd_comment"> &lt;/LikeThisQuery&gt; </span>
<span class="dtd_comment"> % </span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> (</span><span class="dtd_keyword">#PCDATA</span><span class="dtd_plain">)</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Optional boost for matches on this query. Values &gt; 1 --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">boost</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1.0&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Comma delimited list of field names --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">fieldNames</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_keyword">#IMPLIED</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- a list of stop words - analyzed to produce stop terms --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">stopWords</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_keyword">#IMPLIED</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- controls the maximum number of words shortlisted for the query. The higher the number the slower the response due to more disk reads required --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">maxQueryTerms</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;20&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Controls how many times a term must appear in the example text before it is shortlisted for use in the query --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">minTermFrequency</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- A quality control that can be used to limit the number of results to those documents matching a certain percentage of the shortlisted query terms.</span>
<span class="dtd_comment"> Values must be between 1 and 100--&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">LikeThisQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">percentTermsToMatch</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;30&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!--</span>
<span class="dtd_comment"> Requires matches on the &quot;Query&quot; element and optionally boosts by any matches on the &quot;BoostQuery&quot;.</span>
<span class="dtd_comment"> Unlike a regular BooleanQuery the boost can be less than 1 to produce a subtractive rather than additive result</span>
<span class="dtd_comment"> on the match score. </span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> &lt;em&gt;Find documents about banks, preferably related to mergers, and preferably not about &quot;World bank&quot;&lt;/em&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> &lt;BoostingQuery&gt;</span>
<span class="dtd_comment"> &lt;Query&gt;</span>
<span class="dtd_comment"> &lt;BooleanQuery fieldName=&quot;contents&quot;&gt;</span>
<span class="dtd_comment"> &lt;Clause occurs=&quot;should&quot;&gt;</span>
<span class="dtd_comment"> &lt;TermQuery&gt;merger&lt;/TermQuery&gt;</span>
<span class="dtd_comment"> &lt;/Clause&gt;</span>
<span class="dtd_comment"> &lt;Clause occurs=&quot;must&quot;&gt;</span>
<span class="dtd_comment"> &lt;TermQuery&gt;bank&lt;/TermQuery&gt;</span>
<span class="dtd_comment"> &lt;/Clause&gt;</span>
<span class="dtd_comment"> &lt;/BooleanQuery&gt; </span>
<span class="dtd_comment"> &lt;/Query&gt;</span>
<span class="dtd_comment"> &lt;BoostQuery boost=&quot;0.01&quot;&gt;</span>
<span class="dtd_comment"> &lt;UserQuery&gt;&quot;world bank&quot;&lt;/UserQuery&gt;</span>
<span class="dtd_comment"> &lt;/BoostQuery&gt;</span>
<span class="dtd_comment"> &lt;/BoostingQuery&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> </span>
<span class="dtd_comment">--&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">BoostingQuery</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">Query</span><span class="dtd_plain">,</span><span class="dtd_attribute_name">BoostQuery</span><span class="dtd_plain">)</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Optional boost for matches on this query. Values &gt; 1 --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">BoostingQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">boost</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1.0&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!--</span>
<span class="dtd_comment"> Child element of BoostingQuery used to contain the choice of Query which is used for boosting purposes</span>
<span class="dtd_comment">--&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">BoostQuery</span><span class="dtd_plain"> (%</span><span class="dtd_attribute_name">queries</span><span class="dtd_plain">;)</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Optional boost for matches on this query. A boost of &gt;0 but &lt;1 </span>
<span class="dtd_comment"> effectively demotes results from Query that match this BoostQuery. </span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">BoostQuery</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">boost</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_attribute_value">&quot;1.0&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Removes duplicated documents from results where &quot;duplicate&quot; means documents share a value for a particular field such as a primary key</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> &lt;em&gt;Find the latest version of each web page that mentions &quot;Lucene&quot;&lt;/em&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> &lt;FilteredQuery&gt;</span>
<span class="dtd_comment"> &lt;Query&gt;</span>
<span class="dtd_comment"> &lt;TermQuery fieldName=&quot;text&quot;&gt;lucene&lt;/TermQuery&gt;</span>
<span class="dtd_comment"> &lt;/Query&gt;</span>
<span class="dtd_comment"> &lt;Filter&gt;</span>
<span class="dtd_comment"> &lt;DuplicateFilter fieldName=&quot;url&quot; keepMode=&quot;last&quot;/&gt;</span>
<span class="dtd_comment"> &lt;/Filter&gt; </span>
<span class="dtd_comment"> &lt;/FilteredQuery&gt; </span>
<span class="dtd_comment"> % </span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">DuplicateFilter</span><span class="dtd_plain"> </span><span class="dtd_keyword">EMPTY</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- fieldName must be defined here or is taken from the most immediate parent XML element that defines a &quot;fieldName&quot; attribute --&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">DuplicateFilter</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">fieldName</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_keyword">#IMPLIED</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Determines if the first or last document occurence is the one to return when presented with duplicated field values --&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">DuplicateFilter</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">keepMode</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">first</span><span class="dtd_plain"> | </span><span class="dtd_attribute_name">last</span><span class="dtd_plain">) </span><span class="dtd_attribute_value">&quot;first&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Controls the choice of process used to produce the filter - &quot;full&quot; mode identifies only non-duplicate documents with the chosen field </span>
<span class="dtd_comment"> while &quot;fast&quot; mode may perform faster but will also mark documents &lt;em&gt;without&lt;/em&gt; the field as valid. The former approach starts by </span>
<span class="dtd_comment"> assuming every document is a duplicate then finds the &quot;master&quot; documents to keep while the latter approach assumes all documents are </span>
<span class="dtd_comment"> unique and unmarks those documents that are a copy. </span>
<span class="dtd_comment"> --&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">DuplicateFilter</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">processingMode</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">full</span><span class="dtd_plain"> | </span><span class="dtd_attribute_name">fast</span><span class="dtd_plain">) </span><span class="dtd_attribute_value">&quot;full&quot;</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- Processes child text using a field-specific choice of Analyzer to produce a set of terms that are then used as a filter.</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> &lt;em&gt;Find documents talking about Lucene written on a Monday or a Friday&lt;/em&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> &lt;FilteredQuery&gt;</span>
<span class="dtd_comment"> &lt;Query&gt;</span>
<span class="dtd_comment"> &lt;TermQuery fieldName=&quot;text&quot;&gt;lucene&lt;/TermQuery&gt;</span>
<span class="dtd_comment"> &lt;/Query&gt;</span>
<span class="dtd_comment"> &lt;Filter&gt;</span>
<span class="dtd_comment"> &lt;TermsFilter fieldName=&quot;dayOfWeek&quot;&gt;monday friday&lt;/TermsFilter&gt; </span>
<span class="dtd_comment"> &lt;/Filter&gt; </span>
<span class="dtd_comment"> &lt;/FilteredQuery&gt; </span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> </span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">TermsFilter</span><span class="dtd_plain"> (</span><span class="dtd_keyword">#PCDATA</span><span class="dtd_plain">)</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!-- fieldName must be defined here or is taken from the most immediate parent XML element that defines a &quot;fieldName&quot; attribute --&gt;</span><span class="dtd_plain"> </span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ATTLIST</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">TermsFilter</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">fieldName</span><span class="dtd_plain"> </span><span class="dtd_keyword">CDATA</span><span class="dtd_plain"> </span><span class="dtd_keyword">#IMPLIED</span><span class="dtd_tag_symbols">&gt;</span>
<span class="dtd_comment">&lt;!--</span>
<span class="dtd_comment"> A Filter equivalent to BooleanQuery that applies Boolean logic to Clauses containing Filters.</span>
<span class="dtd_comment"> Unlike BooleanQuery a BooleanFilter can contain a single &quot;mustNot&quot; clause.</span>
<span class="dtd_comment"> </span><span class="dtd_dtddoc_tag">@example</span><span class="dtd_comment"> &lt;em&gt;Find documents from the first quarter of this year or last year that are not in &quot;draft&quot; status&lt;/em&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> &lt;FilteredQuery&gt;</span>
<span class="dtd_comment"> &lt;Query&gt;</span>
<span class="dtd_comment"> &lt;MatchAllDocsQuery/&gt;</span>
<span class="dtd_comment"> &lt;/Query&gt;</span>
<span class="dtd_comment"> &lt;Filter&gt;</span>
<span class="dtd_comment"> &lt;BooleanFilter&gt;</span>
<span class="dtd_comment"> &lt;Clause occurs=&quot;should&quot;&gt;</span>
<span class="dtd_comment"> &lt;RangeFilter fieldName=&quot;date&quot; lowerTerm=&quot;20070101&quot; upperTerm=&quot;20070401&quot;/&gt;</span>
<span class="dtd_comment"> &lt;/Clause&gt;</span>
<span class="dtd_comment"> &lt;Clause occurs=&quot;should&quot;&gt;</span>
<span class="dtd_comment"> &lt;RangeFilter fieldName=&quot;date&quot; lowerTerm=&quot;20060101&quot; upperTerm=&quot;20060401&quot;/&gt;</span>
<span class="dtd_comment"> &lt;/Clause&gt;</span>
<span class="dtd_comment"> &lt;Clause occurs=&quot;mustNot&quot;&gt;</span>
<span class="dtd_comment"> &lt;TermsFilter fieldName=&quot;status&quot;&gt;draft&lt;/TermsFilter&gt; </span>
<span class="dtd_comment"> &lt;/Clause&gt;</span>
<span class="dtd_comment"> &lt;/BooleanFilter&gt;</span>
<span class="dtd_comment"> &lt;/Filter&gt;</span>
<span class="dtd_comment"> &lt;/FilteredQuery&gt;</span>
<span class="dtd_comment"> %</span>
<span class="dtd_comment"> --&gt;</span>
<span class="dtd_tag_symbols">&lt;!</span><span class="dtd_tag_name">ELEMENT</span><span class="dtd_plain"> </span><span class="dtd_attribute_name">BooleanFilter</span><span class="dtd_plain"> (</span><span class="dtd_attribute_name">Clause</span><span class="dtd_plain">)+</span><span class="dtd_tag_symbols">&gt;</span>
</pre>
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