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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>dlvhex</title>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css"></link>
<link rel="stylesheet" type="text/css" media="all" href="css/text.css"></link>
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<link rel="stylesheet" type="text/css" media="all" href="css/style.css"></link>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<!-- Title -->
<!--
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<h1>dlvhex</h1>
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<a href="index.html">About</a>
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<!-- Information -->
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<div class="grid_9">
<h2>The Description Logic Plugin</h2>
<p>
The Description Logic Plugin interfaces OWL ontologies by
using a description logic reasoner. It provides three atoms—two
for retrieving concept resp. role members and one for
testing the DL-KB for consistency.
</p>
<div class="synopsis">
<div class="atomusage">&dlC[KB,a,b,c,d,Q](X)</div>
<div>Input:</div>
<div class="param">KB</div>
<div class="paramtext">web address or file path of the OWL Ontology.</div>
<div class="param">a</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to a concept.</div>
<div class="param">b</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to the complement of a concept.</div>
<div class="param">c</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to a role.</div>
<div class="param">d</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to the complement of a role.</div>
<div class="param">Q</div>
<div class="paramtext">name of a concept to be queried.</div>
<div style="clear: both;"></div>
<div>Output:</div>
<div class="param">X</div>
<div class="paramtext">individuals of concept <code>Q</code></div>
<div style="clear: both;"></div>
</div>
<p>
This looks more difficult than it actually is. For a simple query, all you need is the first and the last input argument.
</p>
<pre>
student(X) :- &dlC["http://example.org/univ.owl",a,b,c,d,"student"](X).</pre>
<p>
Provided that <code>a</code>, <code>b</code>, <code>c</code>, and <code>d</code> do not occur elsewhere in the hex-program, this rule would do nothing else than putting all members of <code>student</code> into the predicate <code>student</code>.
</p>
<p>
Now imagine you want to extend the concept <code>freshman</code> by "John Doe" before actually querying <code>student</code>:
</p>
<pre>
student(X) :- &dlC["http://example.org/univ.owl",a,b,c,d,"student"](X).
a(freshman,"John Doe").</pre>
<p>
Thus, at the second position of its input list, the external atom expects a binary predicate, whose first argument denotes the concept to be extended and the second the actual individuals to be aded to the concept. Naturally, this can become very versatile:
</p>
<pre>
student(X) :- &dlC["http://example.org/univ.owl",a,b,c,d,"student"](X).
a(freshman,X) :- attends(X,Y), firstyearcourse(Y).</pre>
<p>
Adding to roles works analogously, e.g.:
</p>
<pre>
student(X) :- &dlC["http://example.org/univ.owl",a,b,c,d,"student"](X).
b(enrolled,X,Y) :- person(X), studies(X,Y).</pre>
<p>
The second atom follows the same input mechansim, but queries a role:
</p>
<div class="synopsis">
<div class="atomusage">&dlR[KB,a,b,c,d,Q](X,Y)</div>
<div>Input:</div>
<div class="param">KB</div>
<div class="paramtext">web address or file path of the OWL Ontology.</div>
<div class="param">a</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to a concept.</div>
<div class="param">b</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to the complement of a concept.</div>
<div class="param">c</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to a role.</div>
<div class="param">d</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to the complement of a role.</div>
<div class="param">Q</div>
<div class="paramtext">name of a object property to be queried.</div>
<div style="clear: both;"></div>
<div>Output:</div>
<div class="param">X,Y</div>
<div class="paramtext">pairs of individuals of property <code>Q</code></div>
<div style="clear: both;"></div>
</div>
<p>
For datatype properties you have to use a different atom:
</p>
<div class="synopsis">
<div class="atomusage">&dlDR[KB,a,b,c,d,Q](X,Y)</div>
<div>Input:</div>
<div class="param">KB</div>
<div class="paramtext">web address or file path of the OWL Ontology.</div>
<div class="param">a</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to a concept.</div>
<div class="param">b</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to the complement of a concept.</div>
<div class="param">c</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to a role.</div>
<div class="param">d</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to the complement of a role.</div>
<div class="param">Q</div>
<div class="paramtext">name of a datatype property to be queried.</div>
<div style="clear: both;"></div>
<div>Output:</div>
<div class="param">X,Y</div>
<div class="paramtext">pairs of individuals of property <code>Q</code></div>
<div style="clear: both;"></div>
</div>
<p>
Additionally, the DL-Plugin provides an external atom which tests the given DL-KB for consistency under the specified extensions:
</p>
<div class="synopsis">
<div class="atomusage">&dlConsistent[KB,a,b,c,d]()</div>
<div>Input:</div>
<div class="param">KB</div>
<div class="paramtext">web address or file path of the OWL Ontology.</div>
<div class="param">a</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to a concept.</div>
<div class="param">b</div>
<div class="paramtext">name of a binary predicate whose extension denotes addition to the complement of a concept.</div>
<div class="param">c</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to a role.</div>
<div class="param">d</div>
<div class="paramtext">name of a ternary predicate whose extension denotes addition to the complement of a role.</div>
<div style="clear: both;"></div>
<div>Output:</div>
<div class="param"> </div>
<div class="paramtext">none.</div>
<div style="clear: both;"></div>
</div>
<p>
If the KB is consistent after possibly augmenting the A-Box according to the input list, the atom evaluates to <i>true</i>, otherwise <i>false</i>.
</p>
<div style="border-top: 1px solid #999; background-color: inherit; color: #999; font-size: 8.5pt;">
<p>$Id$</p>
</div>
</div>
<div class="grid_3">
<p> </p>
<p>
<img width="200" height="44" src="images/logo_whitebg.png" alt="dlvhex" id="logo">
</p>
<p>
<div style="font-size: 14pt"><label for="q">Search this Website</label></div>
<form action="http://www.google.com/cse" id="cse-search-box">
<div>
<input name="cx" id="cx" value="010363983165505105153:4bhl-l5ixd4" type="hidden" alt="Search this website">
<input name="ie" id="ie" value="UTF-8" type="hidden" alt="Search this website">
<input style="background: rgb(255, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;" name="q" id="q" size="19" type="text">
<input name="sa" id="sa" value="Go" type="submit">
</div>
</form>
</p>
<p>
<span style="font-size: 14pt">General</span><br>
<a href="https://github.com/hexhex/">dlvhex source code @ github.com</a><br>
<!-- a href="https://sourceforge.net/projects/dlvhex/">dlvhex: Sourceforge project</a><br/ -->
<a href="doap.rdf">Description-Of-A-Project</a>
</p>
<p>
<span style="font-size: 14pt">Popular Plugins</span><br>
<!-- <a href="http://www.polleres.net/dlvhex-sparql">SPARQL Plugin</a><br> -->
<a href="actionplugin.html">Action Plugin</a><br>
<a href="decisiondiagramsplugin.html">DecisionDiagrams Plugin</a><br>
<a href="dlplugin.html">Description Logics Plugin</a><br>
<a href="dlliteplugin.html">Description Logics Lite Plugin</a><br>
<a href="mergingplugin.html">MELD: Belief Merging Plugin</a><br>
<a href="nestedhexplugin.html">Nested HEX Plugin</a><br>
<a href="http://www.kr.tuwien.ac.at/research/systems/mcsie">MCSIE Plugin</a><br>
<a href="stringplugin.html">String Plugin</a><br>
<a href="https://sourceforge.net/projects/dlvhex-semweb/">dlvhex-semweb Project</a><br>
</p>
<p>
<span style="font-size: 14pt">Documentation</span><br>
<a href="docs/userguide.pdf">User Guide</a><br>
<a href="https://github.com/hexhex/core/blob/master/README">README</a><br>
<a href="doc2x">doxygen</a><br>
<a href="doc2x/group__pluginframework.html">Writing Plugins in C++</a><br>
<a href="doc2x/group__pythonpluginframework.html">Writing Plugins in Python</a>
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<a href="doc1x">doxygen version 1.X</a><br>
<a href="doc1x/group__pluginframework.html">Writing Plugins 1.X</a><br>
-->
</p>
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</body>
</html>
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