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<a href="#rasqal-section-triple.synopsis" class="shortcut">Top</a>
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                  <a href="#rasqal-section-triple.description" class="shortcut">Description</a>
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<a name="rasqal-section-triple"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="rasqal-section-triple.top_of_page"></a>Triples</span></h2>
<p>Triples — Triple pattern or RDF triple.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="rasqal-section-triple.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple">rasqal_triple</a>;
<a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="returnvalue">rasqal_triple</span></a> *     <a class="link" href="rasqal-section-triple.html#rasqal-new-triple" title="rasqal_new_triple ()">rasqal_new_triple</a>                   (<em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *subject</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *predicate</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *object</code></em>);
<a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="returnvalue">rasqal_triple</span></a> *     <a class="link" href="rasqal-section-triple.html#rasqal-new-triple-from-triple" title="rasqal_new_triple_from_triple ()">rasqal_new_triple_from_triple</a>       (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="rasqal-section-triple.html#rasqal-free-triple" title="rasqal_free_triple ()">rasqal_free_triple</a>                  (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);
<a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="returnvalue">rasqal_literal</span></a> *    <a class="link" href="rasqal-section-triple.html#rasqal-triple-get-origin" title="rasqal_triple_get_origin ()">rasqal_triple_get_origin</a>            (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);
enum                <a class="link" href="rasqal-section-triple.html#rasqal-triple-parts" title="enum rasqal_triple_parts">rasqal_triple_parts</a>;
<span class="returnvalue">int</span>                 <a class="link" href="rasqal-section-triple.html#rasqal-triple-print" title="rasqal_triple_print ()">rasqal_triple_print</a>                 (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>,
                                                         <em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="rasqal-section-triple.html#rasqal-triple-set-origin" title="rasqal_triple_set_origin ()">rasqal_triple_set_origin</a>            (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *l</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="rasqal-section-triple.description"></a><h2>Description</h2>
<p>
An object for a triple pattern or an RDF triple in a query.  It
contains the three parts of an RDF triple - subject, predicate,
object as well as origin for matching triples in some graph (such as
with the SPARQL <code class="literal">GRAPH</code>).
</p>
</div>
<div class="refsect1">
<a name="rasqal-section-triple.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rasqal-triple"></a><h3>rasqal_triple</h3>
<pre class="programlisting">typedef struct {
  rasqal_literal* subject;
  rasqal_literal* predicate;
  rasqal_literal* object;
  rasqal_literal* origin;
  unsigned int flags;
} rasqal_triple;
</pre>
<p>
A triple pattern or RDF triple.
</p>
<p>
This is used as a triple pattern in queries and
an RDF triple when generating RDF triples such as with SPARQL CONSTRUCT.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *<em class="structfield"><code><a name="rasqal-triple.subject"></a>subject</code></em>;</span></p></td>
<td>Triple subject.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *<em class="structfield"><code><a name="rasqal-triple.predicate"></a>predicate</code></em>;</span></p></td>
<td>Triple predicate.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *<em class="structfield"><code><a name="rasqal-triple.object"></a>object</code></em>;</span></p></td>
<td>Triple object.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *<em class="structfield"><code><a name="rasqal-triple.origin"></a>origin</code></em>;</span></p></td>
<td>Triple origin.</td>
</tr>
<tr>
<td><p><span class="term">unsigned <span class="type">int</span> <em class="structfield"><code><a name="rasqal-triple.flags"></a>flags</code></em>;</span></p></td>
<td>Or of enum <span class="type">rasqal_triple_flags</span> bits.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-triple"></a><h3>rasqal_new_triple ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="returnvalue">rasqal_triple</span></a> *     rasqal_new_triple                   (<em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *subject</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *predicate</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *object</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> triple or triple pattern.
Takes ownership of the literals passed in.
</p>
<p>
The triple origin can be set with <a class="link" href="rasqal-section-triple.html#rasqal-triple-set-origin" title="rasqal_triple_set_origin ()"><code class="function">rasqal_triple_set_origin()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>subject</code></em> :</span></p></td>
<td>Triple subject.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>predicate</code></em> :</span></p></td>
<td>Triple predicate.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>Triple object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> or NULL on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-triple-from-triple"></a><h3>rasqal_new_triple_from_triple ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="returnvalue">rasqal_triple</span></a> *     rasqal_new_triple_from_triple       (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);</pre>
<p>
Copy constructor - create a new <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> from an existing one.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>Triple to copy.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> or NULL on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-free-triple"></a><h3>rasqal_free_triple ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                rasqal_free_triple                  (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);</pre>
<p>
Destructor - destroy a <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> object.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triple-get-origin"></a><h3>rasqal_triple_get_origin ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="returnvalue">rasqal_literal</span></a> *    rasqal_triple_get_origin            (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>);</pre>
<p>
Get the origin field of a <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>The triple object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The triple origin or NULL.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triple-parts"></a><h3>enum rasqal_triple_parts</h3>
<pre class="programlisting">typedef enum {
  RASQAL_TRIPLE_NONE     = 0,
  RASQAL_TRIPLE_SUBJECT  = 1,
  RASQAL_TRIPLE_PREDICATE= 2,
  RASQAL_TRIPLE_OBJECT   = 4,
  RASQAL_TRIPLE_ORIGIN   = 8,
  RASQAL_TRIPLE_GRAPH    = RASQAL_TRIPLE_ORIGIN,
  RASQAL_TRIPLE_SPO      = RASQAL_TRIPLE_SUBJECT | RASQAL_TRIPLE_PREDICATE | RASQAL_TRIPLE_OBJECT,
  RASQAL_TRIPLE_SPOG     = RASQAL_TRIPLE_SPO | RASQAL_TRIPLE_GRAPH
} rasqal_triple_parts;
</pre>
<p>
Flags for parts of a triple.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="RASQAL-TRIPLE-NONE:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_NONE</code></span></p></td>
<td>no parts
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-SUBJECT:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_SUBJECT</code></span></p></td>
<td>Subject present in a triple.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-PREDICATE:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_PREDICATE</code></span></p></td>
<td>Predicate present in a triple.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-OBJECT:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_OBJECT</code></span></p></td>
<td>Object present in a triple.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-ORIGIN:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_ORIGIN</code></span></p></td>
<td>Origin/graph present in a triple.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-GRAPH:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_GRAPH</code></span></p></td>
<td>Alias for RASQAL_TRIPLE_ORIGIN
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-SPO:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_SPO</code></span></p></td>
<td>Subject, Predicate and Object present in a triple.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLE-SPOG:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLE_SPOG</code></span></p></td>
<td>Subject, Predicate, Object, Graph present in a triple.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triple-print"></a><h3>rasqal_triple_print ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 rasqal_triple_print                 (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>,
                                                         <em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Print a Rasqal triple in a debug format.
</p>
<p>
The print debug format may change in any release.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>The FILE* handle to print to.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-0 on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triple-set-origin"></a><h3>rasqal_triple_set_origin ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                rasqal_triple_set_origin            (<em class="parameter"><code><a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> *t</code></em>,
                                                         <em class="parameter"><code><a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> *l</code></em>);</pre>
<p>
Set the origin field of a <a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>The triple object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>l</code></em> :</span></p></td>
<td>The <a class="link" href="rasqal-section-literal.html#rasqal-literal" title="rasqal_literal"><span class="type">rasqal_literal</span></a> object to set as origin.</td>
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