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facet_doc.html
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<?xml version="1.0" encoding="utf-8"?>
<!--
--
-- $Id$
--
-- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
-- project.
--
-- Copyright (C) 1998-2021 OpenLink Software
--
-- This project is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; only version 2 of the License, dated June 1991.
--
-- This program is distributed in the hope that it will be useful, but
-- WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along
-- with this program; if not, write to the Free Software Foundation, Inc.,
-- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
--
-->
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<?vsp set http_charset='utf-8'; ?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Entity Search, Find, and Explore - Documentation</title>
<link rel="stylesheet" media="screen" type="text/css" href="/fct/css/default.css"/>
<script type="text/javascript" >
var featureList=["map", "combolist"];
</script>
<script type="text/javascript" src="oat/toolkit/loader.js"></script>
</head>
<body>
<div id="PG">
<div id="HD">
<div id="hd_l">
<h1>
<div id="logo">
<a href="/fct/facet.vsp">
<img src="/fct/images/openlink_site_logo.png"
alt="OpenLink Software"/>
</a>
</div>
</h1>
<div id="homelink"></div>
</div> <!-- hd_l -->
<div id="hd_r">
<a href="http://data.openlinksw.com/about/html/http://data.openlinksw.com/oplweb/product_family/virtuoso"
title="OpenLink Virtuoso">
<img class="powered_by" src="/fct/images/virt_power_no_border.png" alt="Powered by OpenLink Virtuoso"/>
</a>
</div> <!-- hd_r -->
</div> <!-- #HD -->
<div id="MD">
<div class="doc_ctr">
<h1>Entity Search, Find, and Explore - Documentation</h1>
<p></p>
<h2>Text Search</h2>
<p>Enter a text pattern to look for. Finder will show a listing of entities with the text
occurring in any literal property value or label. You may then continue to refine your search
by filtering by type, property value, etc.</p>
<h2>Entity URI (ID) Lookup</h2>
<p>You can lookup an Entity URI using the autocomplete feature which performs lookups as you type.
The OpenLink Finder recognizes some well-known namespace prefixes. For example: "dbpedia:"</p>
<h2>Results Order & Ranking</h2>
<p>On some listings, results are sorted using a combination of text match score and entity-attribute-value
link coefficients. Thus, a small indicator graphic (horizontal bars in leftmost column) is used to unveil
metrics for both rankings per entity; the top bar indicates the text score while the bottom covers the entity
ranking. Hovering on either will reveal the actual value.</p>
<h3>Text Scores</h3>
<p>These are proportional to the frequency of the search terms in the match and if many terms are present,
the score weight is increased by a proximity factor.
<h3>Entity Rank</h3>
<p>Entity matches are ranked based on how frequently they are referenced by other entities. Rankings
are increased as a function of the score of the referencing entity.</p>
<a name="timeout"></a><h2>Timeouts</h2>
<p>The Virtuoso 6.x engine includes a new "Anytime Query" feature that enables the optional use of a configurable
response time threshold (timeout) when executing queries over large
datasets. This feature protects against deliberate or inadvertent denial-of-service style resource-hogging
that can arise from badly written or complex queries.
When enabled, this feature lets you to set hard limit for resource usage per query associated with
unauthenticated users. Queries execute until the response time limit threshold is reached, and, if partial
results are available, they are returned with additional result set diagnostics flagging the partial nature
of the result set. All query handling is partitioned thereby protecting against cross-client resource
contention.</p>
<p>This service currently enforces a 20 second hard time limit for queries. Each query is first run with a 2 second timeout -
if only a partial result or no results are received, the user is prompted to retry with double the previous time limit until
the hard limit is reached.</p>
<h2>OpenSearch</h2>
<p>You can add this service as a search engine plugin in OpenSearch capable browsers. You can do this in Firefox by using the pulldown
next to the search text input in Facet search main page.</p>
<h3>More Information</h3>
<ul>
<li><a href="http://www.opensearch.org">OpenSearch.org</a></li>
</ul>
<h2>Available datasets</h2>
<p>
The <a href="/void/Dataset">VoiD graph</a> contains information about <a href="/fct/images/lod-datasets_2009-03-27_colored.png">Linked Open Data Cloud</a> datasets hosted by this instance.
</p>
<h2>More Information</h2>
<ul>
<li><a href="http://docs.openlinksw.com/virtuoso/">OpenLink Virtuoso Documentation Main Page</a></li>
<li><a href="http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtuosoFacetsWebService">Virtuoso Facets Web Service Documentation</a></li>
</ul>
<p>
<a href="javascript:history.back()">Go Back</a>
</p>
</div> <!-- .doc_ctr -->
</div><!-- #MD -->
<div id="FT">
<a href="http://virtuoso.openlinksw.com/"><img src="/fct/images/virt_power_no_border.png" alt="Powered by OpenLink Virtuoso"/></a>
<a href="http://linkeddata.org"><img src="/fct/images/LoDLogo.gif" alt="Linked Data"/></a><br/>
<span class="copyright">Copyright © 2009-2021 OpenLink Software</span>
<div id="FT_L"></div>
<div id="FT_R"></div>
</div>
</div> <!-- #PG -->
</body>
</html>