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<a href="#redland-heuristics.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="redland-heuristics.top_of_page"></a>Heuristics</span></h2>
<p>Heuristics — Utility heuristic functions.</p>
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<a name="redland-heuristics.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><span class="returnvalue">char</span> * <a class="link" href="redland-heuristics.html#librdf-heuristic-gen-name" title="librdf_heuristic_gen_name ()">librdf_heuristic_gen_name</a> (<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-heuristics.html#librdf-heuristic-is-blank-node" title="librdf_heuristic_is_blank_node ()">librdf_heuristic_is_blank_node</a> (<em class="parameter"><code>const <span class="type">char</span> *node</code></em>);
const <span class="returnvalue">char</span> * <a class="link" href="redland-heuristics.html#librdf-heuristic-get-blank-node" title="librdf_heuristic_get_blank_node ()">librdf_heuristic_get_blank_node</a> (<em class="parameter"><code>const <span class="type">char</span> *node</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-heuristics.html#librdf-heuristic-object-is-literal" title="librdf_heuristic_object_is_literal ()">librdf_heuristic_object_is_literal</a> (<em class="parameter"><code>const <span class="type">char</span> *object</code></em>);
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<div class="refsect1">
<a name="redland-heuristics.description"></a><h2>Description</h2>
<p>
Various utility functions for performing heuristics such as
generating a name, guessing if a string is a URI or RDF literal.
</p>
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<a name="redland-heuristics.details"></a><h2>Details</h2>
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<a name="librdf-heuristic-gen-name"></a><h3>librdf_heuristic_gen_name ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> * librdf_heuristic_gen_name (<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>
Generate a new name from an existing name.
</p>
<p>
Adds an integer or increases the integer at the end of the name
in order to generate a new one
</p>
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<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new name or NULL on failure</td>
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<div class="refsect2">
<a name="librdf-heuristic-is-blank-node"></a><h3>librdf_heuristic_is_blank_node ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_heuristic_is_blank_node (<em class="parameter"><code>const <span class="type">char</span> *node</code></em>);</pre>
<p>
Try to guess if an node string is a blank node identifier.
</p>
<p>
The guessing is done by assuming the object is a blank node if it matches
^_: like N-Triples, N3 and related.
</p>
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<td><p><span class="term"><em class="parameter"><code>node</code></em> :</span></p></td>
<td>string object to guess type</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non 0 if node is probably a blank node identifier</td>
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<div class="refsect2">
<a name="librdf-heuristic-get-blank-node"></a><h3>librdf_heuristic_get_blank_node ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> * librdf_heuristic_get_blank_node (<em class="parameter"><code>const <span class="type">char</span> *node</code></em>);</pre>
<p>
Get a blank node identifier from a node string.
</p>
<p>
Picks the blank node identifier out of a string. Looks for things
like _:ABC
</p>
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<td><p><span class="term"><em class="parameter"><code>node</code></em> :</span></p></td>
<td>string object to guess type</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the blank node identifer string or NULL if the node does not seem to be a blank node identifier</td>
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<div class="refsect2">
<a name="librdf-heuristic-object-is-literal"></a><h3>librdf_heuristic_object_is_literal ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_heuristic_object_is_literal (<em class="parameter"><code>const <span class="type">char</span> *object</code></em>);</pre>
<p>
Try to guess if an object string is a literal or a resource.
</p>
<p>
The guessing is done by assuming the object is a URL if it matches
^[<code class="function">isalnum()</code>]+:[^<code class="function">isblank()</code>]+$
</p>
<p>
This will be fooled by literals of form 'thing:non-blank-thing' but
is good enough.
</p>
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>string object to guess type</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non 0 if object is probably a literal</td>
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