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