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<title>Data Graphs</title>
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<link rel="start" href="index.html" title="Rasqal RDF Query Library Manual">
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<link rel="part" href="pt01.html" title="Part I. Reference Manual">
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<th width="100%" align="center">Rasqal RDF Query Library Manual</th>
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#rasqal-section-data.synopsis" class="shortcut">Top</a>
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<a href="#rasqal-section-data.description" class="shortcut">Description</a></nobr></td></tr>
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</table>
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<div class="refentry" lang="en">
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<a name="rasqal-section-data"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="rasqal-section-data.top_of_page"></a>Data Graphs</span></h2>
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<p>Data Graphs — RDF graph sources for triples.</p>
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</td>
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<td valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<a name="rasqal-section-data.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis">
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<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a>;
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<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-new-data-graph" title="rasqal_new_data_graph ()">rasqal_new_data_graph</a> (<a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *uri,
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<a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *name_uri,
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int flags);
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void <a class="link" href="rasqal-section-data.html#rasqal-free-data-graph" title="rasqal_free_data_graph ()">rasqal_free_data_graph</a> (<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a> *dg);
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enum <a class="link" href="rasqal-section-data.html#rasqal-data-graph-flags" title="enum rasqal_data_graph_flags">rasqal_data_graph_flags</a>;
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void <a class="link" href="rasqal-section-data.html#rasqal-data-graph-print" title="rasqal_data_graph_print ()">rasqal_data_graph_print</a> (<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a> *dg,
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FILE *fh);
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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="rasqal-section-data.description"></a><h2>Description</h2>
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<p>
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Data graphs are used in the query to describe RDF graphs that can be
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used to query against. The graphs can be used either with <a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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><span class="type">raptor_uri</span></a>
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to name the graph, or without a name. The query language determines
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which graphs are used in the query.
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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="rasqal-section-data.details"></a><h2>Details</h2>
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<div class="refsect2" lang="en">
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<a name="rasqal-data-graph"></a><h3>rasqal_data_graph</h3>
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<pre class="programlisting">typedef struct {
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raptor_uri* uri;
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raptor_uri* name_uri;
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int flags;
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} rasqal_data_graph;
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</pre>
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<p>
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A source of RDF data for querying.
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</p>
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<p>
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The <span class="type">uri</span> is the original source (base URI) of the content. It may
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also have an additional name <em class="parameter"><code>name_uri</code></em> as long as <em class="parameter"><code>flags</code></em> is
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<code class="literal">RASQAL_DATA_NAMED</code></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"><a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *<em class="structfield"><code>uri</code></em>;</span></p></td>
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<td> source URI
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *<em class="structfield"><code>name_uri</code></em>;</span></p></td>
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<td> name of graph for <code class="literal">RASQAL_DATA_NAMED</code>
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</td>
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</tr>
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<tr>
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<td><p><span class="term">int <em class="structfield"><code>flags</code></em>;</span></p></td>
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<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>
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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="rasqal-new-data-graph"></a><h3>rasqal_new_data_graph ()</h3>
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<pre class="programlisting"><a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a>* rasqal_new_data_graph (<a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *uri,
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<a
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href="/usr/share/gtk-doc/html/raptor/raptor-section-uri.html#raptor-uri"
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>raptor_uri</a> *name_uri,
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int flags);</pre>
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<p>
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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>.
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</p>
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<p>
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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>
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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>uri</code></em> :</span></p></td>
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<td> source URI
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>name_uri</code></em> :</span></p></td>
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<td> name of graph (or NULL)
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
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<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>
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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 <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.
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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="rasqal-free-data-graph"></a><h3>rasqal_free_data_graph ()</h3>
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<pre class="programlisting">void rasqal_free_data_graph (<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a> *dg);</pre>
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<p>
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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>
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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><tr>
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<td><p><span class="term"><em class="parameter"><code>dg</code></em> :</span></p></td>
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<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
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</td>
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</tr></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="rasqal-data-graph-flags"></a><h3>enum rasqal_data_graph_flags</h3>
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<pre class="programlisting">typedef enum {
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RASQAL_DATA_GRAPH_NONE = 0,
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RASQAL_DATA_GRAPH_NAMED = 1,
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RASQAL_DATA_GRAPH_BACKGROUND = 2,
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} rasqal_data_graph_flags;
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</pre>
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<p>
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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>.
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</p>
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<p>
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These are used by <a class="link" href="rasqal-section-query.html#rasqal-query-add-data-graph" title="rasqal_query_add_data_graph ()"><code class="function">rasqal_query_add_data_graph()</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>
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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><a name="RASQAL-DATA-GRAPH-NONE:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_NONE</code></span></p></td>
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<td> Internal.
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</td>
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</tr>
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<tr>
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<td><p><a name="RASQAL-DATA-GRAPH-NAMED:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_NAMED</code></span></p></td>
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<td> Graphs with a source and name.
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</td>
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</tr>
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<tr>
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<td><p><a name="RASQAL-DATA-GRAPH-BACKGROUND:CAPS"></a><span class="term"><code class="literal">RASQAL_DATA_GRAPH_BACKGROUND</code></span></p></td>
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<td> Graphs with a source only.
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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="rasqal-data-graph-print"></a><h3>rasqal_data_graph_print ()</h3>
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<pre class="programlisting">void rasqal_data_graph_print (<a class="link" href="rasqal-section-data.html#rasqal-data-graph" title="rasqal_data_graph">rasqal_data_graph</a> *dg,
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FILE *fh);</pre>
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<p>
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Print a Rasqal data graph in a debug format.
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</p>
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<p>
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The print debug format may change in any release.</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>dg</code></em> :</span></p></td>
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<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
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
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<td> the <span class="type">FILE</span>* handle to print to
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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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</div>
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<div class="footer">
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<hr>
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