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<th width="100%" align="center">Rasqal RDF Query Library Manual</th>
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<h2><span class="refentrytitle"><a name="rasqal-section-data.top_of_page"></a>Data Graphs</span></h2>
<p>Data Graphs — RDF graph sources for triples.</p>
</td>
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<div class="refsynopsisdiv">
<a name="rasqal-section-data.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a>;
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * <a class="link" href="rasqal-section-data.html#rasqal-new-data-graph-from-data-graph" title="rasqal_new_data_graph_from_data_graph ()">rasqal_new_data_graph_from_data_graph</a>
(<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>);
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * <a class="link" href="rasqal-section-data.html#rasqal-new-data-graph-from-iostream" title="rasqal_new_data_graph_from_iostream ()">rasqal_new_data_graph_from_iostream</a> (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *name_uri</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> flags</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * <a class="link" href="rasqal-section-data.html#rasqal-new-data-graph-from-uri" title="rasqal_new_data_graph_from_uri ()">rasqal_new_data_graph_from_uri</a> (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *name_uri</code></em>,
<em class="parameter"><code><span class="type">int</span> flags</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);
<span class="returnvalue">void</span> <a class="link" href="rasqal-section-data.html#rasqal-free-data-graph" title="rasqal_free_data_graph ()">rasqal_free_data_graph</a> (<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>);
enum <a class="link" href="rasqal-section-data.html#rasqal-data-graph-flags" title="enum rasqal_data_graph_flags">rasqal_data_graph_flags</a>;
<span class="returnvalue">int</span> <a class="link" href="rasqal-section-data.html#rasqal-data-graph-print" title="rasqal_data_graph_print ()">rasqal_data_graph_print</a> (<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="rasqal-section-data.description"></a><h2>Description</h2>
<p>
Data graphs are used in the query to describe RDF graphs that can be
used to query against. The graphs can be used either with <span class="type">raptor_uri</span>
to name the graph, or without a name. The query language determines
which graphs are used in the query.
</p>
</div>
<div class="refsect1">
<a name="rasqal-section-data.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rasqal-data-graph"></a><h3>rasqal_data_graph</h3>
<pre class="programlisting">typedef struct {
rasqal_world* world;
raptor_uri* uri;
raptor_uri* name_uri;
int flags;
char* format_type;
char* format_name;
raptor_uri* format_uri;
raptor_iostream* iostr;
raptor_uri* base_uri;
int usage;
} rasqal_data_graph;
</pre>
<p>
A source of RDF data for querying.
</p>
<p>
If <em class="parameter"><code>iostr</code></em> is present, the graph can be constructed by parsing the
iostream and using <em class="parameter"><code>base_uri</code></em> as a base uri. Otherwise the graph
can be constructed from the graph at URI <em class="parameter"><code>uri</code></em>.
</p>
<p>
In either case the <em class="parameter"><code>name_uri</code></em> is the graph name as long as <em class="parameter"><code>flags</code></em>
is <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a>
</p>
<div class="variablelist"><table border="0">
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<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *<em class="structfield"><code><a name="rasqal-data-graph.world"></a>world</code></em>;</span></p></td>
<td>rasqal_world object</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">raptor_uri</span> *<em class="structfield"><code><a name="rasqal-data-graph.uri"></a>uri</code></em>;</span></p></td>
<td>source URI</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">raptor_uri</span> *<em class="structfield"><code><a name="rasqal-data-graph.name-uri"></a>name_uri</code></em>;</span></p></td>
<td>name of graph for <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-data-graph.flags"></a>flags</code></em>;</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a> or <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-BACKGROUND:CAPS"><code class="literal">RASQAL_DATA_GRAPH_BACKGROUND</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">char</span> *<em class="structfield"><code><a name="rasqal-data-graph.format-type"></a>format_type</code></em>;</span></p></td>
<td>MIME Type of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">char</span> *<em class="structfield"><code><a name="rasqal-data-graph.format-name"></a>format_name</code></em>;</span></p></td>
<td>Raptor parser Name of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">raptor_uri</span> *<em class="structfield"><code><a name="rasqal-data-graph.format-uri"></a>format_uri</code></em>;</span></p></td>
<td>URI of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">raptor_iostream</span> *<em class="structfield"><code><a name="rasqal-data-graph.iostr"></a>iostr</code></em>;</span></p></td>
<td>Raptor iostream for content, overriding <em class="parameter"><code>uri</code></em> if present (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">raptor_uri</span> *<em class="structfield"><code><a name="rasqal-data-graph.base-uri"></a>base_uri</code></em>;</span></p></td>
<td>base URI for reading from iostream</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-data-graph.usage"></a>usage</code></em>;</span></p></td>
<td>usage count of this object</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-data-graph-from-data-graph"></a><h3>rasqal_new_data_graph_from_data_graph ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * rasqal_new_data_graph_from_data_graph
(<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>);</pre>
<p>
Copy Constructor - create a new <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> object from an existing <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> object.
</p>
<div class="variablelist"><table border="0">
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<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dg</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> object to copy or NULL</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-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> object or NULL if <em class="parameter"><code>dg</code></em> was NULL.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-data-graph-from-iostream"></a><h3>rasqal_new_data_graph_from_iostream ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * rasqal_new_data_graph_from_iostream (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *name_uri</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> flags</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> from iostream content
</p>
<p>
The <em class="parameter"><code>name_uri</code></em> is used when the flags are <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a>.
</p>
<p>
The <em class="parameter"><code>base_uri</code></em> is used to provide the Raptor parser a base URI. If
a base URI is required but none is given, the parsing will fail
and the query that uses this data source will fail.
</p>
<div class="variablelist"><table border="0">
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<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>world</code></em> :</span></p></td>
<td>rasqal_world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iostr</code></em> :</span></p></td>
<td>source graph format iostream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base_uri</code></em> :</span></p></td>
<td>base URI for iostream content</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_uri</code></em> :</span></p></td>
<td>name of graph (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a> or <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-BACKGROUND:CAPS"><code class="literal">RASQAL_DATA_GRAPH_BACKGROUND</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_type</code></em> :</span></p></td>
<td>MIME Type of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_name</code></em> :</span></p></td>
<td>Raptor parser Name of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_uri</code></em> :</span></p></td>
<td>URI of data format at <em class="parameter"><code>uri</code></em> (or NULL)</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-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> or NULL on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-data-graph-from-uri"></a><h3>rasqal_new_data_graph_from_uri ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="returnvalue">rasqal_data_graph</span></a> * rasqal_new_data_graph_from_uri (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *name_uri</code></em>,
<em class="parameter"><code><span class="type">int</span> flags</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *format_name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a>.
</p>
<p>
The name_uri is only used when the flags are <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</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>world</code></em> :</span></p></td>
<td>rasqal_world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>uri</code></em> :</span></p></td>
<td>source URI</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_uri</code></em> :</span></p></td>
<td>name of graph (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-NAMED:CAPS"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></a> or <a class="link" href="rasqal-section-data.html#RASQAL-DATA-GRAPH-BACKGROUND:CAPS"><code class="literal">RASQAL_DATA_GRAPH_BACKGROUND</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_type</code></em> :</span></p></td>
<td>MIME Type of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_name</code></em> :</span></p></td>
<td>Raptor parser Name of data format at <em class="parameter"><code>uri</code></em> (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_uri</code></em> :</span></p></td>
<td>URI of data format at <em class="parameter"><code>uri</code></em> (or NULL)</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-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> or NULL on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-free-data-graph"></a><h3>rasqal_free_data_graph ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> rasqal_free_data_graph (<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>);</pre>
<p>
Destructor - destroy a <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</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>dg</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-data-graph-flags"></a><h3>enum rasqal_data_graph_flags</h3>
<pre class="programlisting">typedef enum {
RASQAL_DATA_GRAPH_NONE = 0,
RASQAL_DATA_GRAPH_NAMED = 1,
RASQAL_DATA_GRAPH_BACKGROUND = 2,
} rasqal_data_graph_flags;
</pre>
<p>
Flags for the type of <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a>.
</p>
<p>
These are used by <a class="link" href="rasqal-section-data.html#rasqal-new-data-graph-from-uri" title="rasqal_new_data_graph_from_uri ()"><code class="function">rasqal_new_data_graph_from_uri()</code></a> and
<a class="link" href="rasqal-section-data.html#rasqal-new-data-graph-from-iostream" title="rasqal_new_data_graph_from_iostream ()"><code class="function">rasqal_new_data_graph_from_iostream()</code></a>. See <a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="RASQAL-DATA-GRAPH-NONE:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_NONE</code></span></p></td>
<td>Internal.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-DATA-GRAPH-NAMED:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></span></p></td>
<td>Graphs with a source and name.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-DATA-GRAPH-BACKGROUND:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_BACKGROUND</code></span></p></td>
<td>Graphs with a source only.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-data-graph-print"></a><h3>rasqal_data_graph_print ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> rasqal_data_graph_print (<em class="parameter"><code><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</span></a> *dg</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Print a Rasqal data graph 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>dg</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph"><span class="type">rasqal_data_graph</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>
</div>
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