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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">
<head>
<title>KRB 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>
<li>&gt;</li>
<li>KRB Syntax</li>
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<div class="document" id="krb-syntax">
<h1 class="title">KRB Syntax</h1>
<p>This section describes the syntax for defining <a class="reference" href="../../logic_programming/rules/index.html">rules</a> in KRB files.</p>
<div class="section">
<h2><a id="keywords" name="keywords">Keywords</a></h2>
<table border="1" class="docutils">
<colgroup>
<col width="31%" />
<col width="38%" />
<col width="31%" />
</colgroup>
<tbody valign="top">
<tr><td>as</td>
<td>foreach</td>
<td>taking</td>
</tr>
<tr><td>assert</td>
<td>in</td>
<td>True</td>
</tr>
<tr><td>bc_extras</td>
<td>None</td>
<td>use</td>
</tr>
<tr><td>check</td>
<td>plan_extras</td>
<td>when</td>
</tr>
<tr><td>extending</td>
<td>python</td>
<td>with</td>
</tr>
<tr><td>False</td>
<td>step</td>
<td>without</td>
</tr>
<tr><td>fc_extras</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
</div>
<div class="section">
<h2><a id="syntax-of-the-entire-krb-file" name="syntax-of-the-entire-krb-file">Syntax of the Entire KRB File</a></h2>
<pre class="literal-block">
file ::= [NL]
['extending' IDENTIFIER ['without' {IDENTIFIER,}] NL]
[{fc_rule}
['fc_extras' NL INDENT
{&lt;python_statement&gt; NL}
DEINDENT]]
[{bc_rule}
['bc_extras' NL INDENT
{&lt;python_statement&gt; NL}
DEINDENT]
['plan_extras' NL INDENT
{&lt;python_statement&gt; NL}
DEINDENT]]
</pre>
<p>The KRB file has three optional parts. It must contain at least one <a class="reference" href="../../logic_programming/rules/index.html">rule</a>
(either <a class="reference" href="../../logic_programming/rules/forward_chaining.html">forward-chaining</a> or <a class="reference" href="../../logic_programming/rules/backward_chaining.html">backward-chaining</a>).</p>
<p>The filename (minus the .krb extension) is the name of the <a class="reference" href="../../knowledge_bases/rule_bases.html">rule base</a>.
This must be a legal Python identifier.</p>
<div class="section">
<h3><a id="extending-clause" name="extending-clause">Extending clause</a></h3>
<p>The optional <tt class="docutils literal"><span class="pre">extending</span></tt> clause, if used, is the first line of the file.
This defines the parent <a class="reference" href="../../knowledge_bases/rule_bases.html">rule base</a> that this <a class="reference" href="../../knowledge_bases/rule_bases.html">rule base</a> <a class="reference" href="../../knowledge_bases/rule_bases.html#rule-base-inheritance">inherits</a> from.
It may also specify a list of <a class="reference" href="../../logic_programming/rules/backward_chaining.html">backward-chaining</a> goal names to be excluded
from this inheritance.</p>
</div>
<div class="section">
<h3><a id="forward-chaining-section" name="forward-chaining-section">Forward-Chaining Section</a></h3>
<p>If the krb file contains any <a class="reference" href="../../logic_programming/rules/forward_chaining.html">forward-chaining</a> rules, a Python source file
will be created named &lt;rb_name&gt;_fc.py, where &lt;rb_name&gt; is the <a class="reference" href="../../knowledge_bases/rule_bases.html">rule base</a>
name.</p>
<p>The syntax of a forward-chaining rule (<a class="reference" href="fc_rule.html">fc_rule</a>) is defined <a class="reference" href="fc_rule.html">here</a>.</p>
<p>The <tt class="docutils literal"><span class="pre">fc_extras</span></tt> may only be used if there are forward-chaining rules.
This allows you to add other Python code (for example, <tt class="docutils literal"><span class="pre">import</span></tt> statements)
to the generated Python source file.</p>
</div>
<div class="section">
<h3><a id="backward-chaining-section" name="backward-chaining-section">Backward-Chaining Section</a></h3>
<p>If the krb file contains any <a class="reference" href="../../logic_programming/rules/backward_chaining.html">backward-chaining</a> rules, a Python source file
will be created named &lt;rb_name&gt;_bc.py, where &lt;rb_name&gt; is the <a class="reference" href="../../knowledge_bases/rule_bases.html">rule base</a>
name.</p>
<p>The syntax of a backward-chaining rule (<a class="reference" href="bc_rule.html">bc_rule</a>) is defined <a class="reference" href="bc_rule.html">here</a>.</p>
<p>The <tt class="docutils literal"><span class="pre">bc_extras</span></tt> can only be used if there are backward-chaining rules.
This allows you to add other Python code (for example, <tt class="docutils literal"><span class="pre">import</span></tt> statements)
to the generated Python source file.</p>
<p>In addition, if any of the backward-chaining rules have <a class="reference" href="../../logic_programming/plans.html">plan</a> code (a
<a class="reference" href="bc_rule.html#with-clause">with clause</a> or any subgoals in the <a class="reference" href="bc_rule.html#when-clause">when clause</a> with a <a class="reference" href="bc_rule.html#plan-spec">plan_spec</a>),
a Python source file will be created named &lt;rb_name&gt;_plans.py,
where &lt;rb_name&gt; is the <cite>rule base</cite> name.</p>
<p>You use the <tt class="docutils literal"><span class="pre">plan_extras</span></tt> to include arbitrary Python code in this plans
file.</p>
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<h3>More:</h3>
<div class="right-item"><a href="fc_rule.html">Fc_rule Syntax</a><p>The syntax of a forward-chaining rule.</p>
</div>
<div class="right-item"><a href="bc_rule.html">Bc_rule Syntax</a><p>The syntax of a backward-chaining rule.</p>
</div>
<div class="right-item"><a href="pattern.html">Pattern Syntax</a><p>The syntax of a pattern used to match data values.</p>
</div>
<div class="right-item"><a href="compound_premise.html">Compound Premise Syntax</a><p>The syntax of compound premises.</p>
</div>
<div class="right-item"><a href="python_premise.html">Python Premise Syntax</a><p>The syntax of a <em>python_premise</em>.</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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