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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 xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<title>KFB Syntax</title>
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<li><a href="../index.html">Home</a></li>
<li>&gt;</li>
<li><a href="index.html">Pyke Syntax</a></li>
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<li>KFB Syntax</li>
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<h1 class="title">KFB Syntax</h1>
<p>This uses the same lexical structure as <a class="reference external" href="index.html#lexical-structure">KRB files</a>, except that the only
keywords are:</p>
<ul class="simple">
<li>None</li>
<li>True</li>
<li>False</li>
</ul>
<p>The name of the <a class="reference external" href="../knowledge_bases/fact_bases.html">fact base</a> is simply the filename with the <tt class="docutils literal"><span class="pre">.kfb</span></tt> suffix
stripped. This must be a valid Python identifier.</p>
<div class="section" id="syntax-for-kfb-file">
<h2>Syntax for KFB File</h2>
<pre class="literal-block">
file ::= [NL] {fact NL}
fact ::= IDENTIFIER '(' [{data,}] ')'
data ::= 'None' | 'True' | 'False'
| NUMBER | IDENTIFIER | STRING
| '(' [{data,}] ')'
</pre>
</div>
<div class="section" id="example">
<h2>Example</h2>
<p>This is taken from the <a class="reference external" href="../examples.html#family-relations">family_relations</a> example:</p>
<pre class="literal-block">
# family.kfb
son_of(bruce, thomas, norma)
son_of(fred_a, thomas, norma)
son_of(tim, thomas, norma)
daughter_of(vicki, thomas, norma)
daughter_of(jill, thomas, norma)
daughter_of(nanette, arthur2, kathleen)
son_of(arthur3, arthur2, kathleen)
daughter_of(sue, arthur2, kathleen)
son_of(ed, arthur2, kathleen)
daughter_of(marilyn, arthur2, kathleen)
son_of(david_b, arthur2, kathleen)
daughter_of(m_helen, arthur2, kathleen)
son_of(m_thomas, bruce, marilyn)
son_of(david_a, bruce, marilyn)
</pre>
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<h3>More:</h3>
<div class="right-item"><a href="kfb_syntax.html">KFB Syntax</a><p>The syntax of <em>Knowledge Fact Base</em> (KFB) files, which is where you
write your universal facts.</p>
</div>
<div class="right-item"><a href="krb_syntax/index.html">KRB Syntax</a><p>Syntax of the <em>Knowledge Rule Base</em> (KRB) files, which is where you
write your rules.</p>
</div>
<div class="right-item"><a href="kqb_syntax.html">KQB Syntax</a><p>The syntax of <em>Knowledge Question Base</em> (KQB) files, which is where you
spell out your end user questions.</p>
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Copyright &copy; 2007-2009 Bruce Frederiksen
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Page last modified
Mon, Oct 27 2008.
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