[dotNetRDF-Develop] Issue CORE-404 has been added to a project you are monitoring.

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<p>The following issue has been added to a project that you are monitoring.</p>
<table border="0">
  <tr>
    <td width="90px" valign="top"><b>Title:</b></td>
    <td>Blank nodes not created correctly for loaded graph after restarting program</td>
  </tr>
  <tr>
    <td><b>Project:</b></td>
    <td>Core Library (dotNetRDF.dll)</td>
  </tr>
  <tr>
    <td><b>Created By:</b></td>
    <td>Marek Obitko</td>
  </tr>
  <tr>
    <td><b>Milestone:</b></td>
    <td>Unassigned</td>
  </tr>
  <tr>
    <td><b>Category:</b></td>
    <td>Update</td>
  </tr>
  <tr>
    <td><b>Priority:</b></td>
    <td>Unassigned</td>
  </tr>
  <tr>
    <td><b>Type:</b></td>
    <td>Bug</td>
  </tr>
  <tr>
    <td><b>Description:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	Steps to reproduce (see also code below):</p>
<p>
	1. Create data with a blank node, for example using INSERT DATA { [ &lt;http://mapping/left&gt; &quot;item1&quot;; &lt;http://mapping/right&gt; &quot;item2&quot; ] }</p>
<p>
	2. Save to file</p>
<p>
	3. Stop and start the program again (important, this doesn&#39;t happen in one run)</p>
<p>
	4. Add another blank node, e.g. by INSERT DATA { [ &lt;http://mapping/left&gt; &quot;item3&quot;; &lt;http://mapping/right&gt; &quot;item4&quot; ] }</p>
<p>
	5. Observe that the new blank node is merged with the original blank node. When multiple blank nodes are created, they are merged together one by one. It seems (but doesn&#39;t have to be) that the problem is that the numbering autosX ID of blank node starts with the same X, even if autosX already exists in the loaded graph.</p>
<p>
	&nbsp;</p>
<p>
	Not using any 3rd party storage. See also examples below.</p>
<p>
	&nbsp;</p>
<p>
	Code demonstrating the bug is as follows:</p>
<p>
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public void DemonstrateBug()<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!File.Exists(@&quot;c:\mapping1.xml&quot;))<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // first pass - create blank node<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IGraph graph = new Graph();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TripleStore tripleStore = new TripleStore();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tripleStore.Add(graph);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlUpdateParser parser = new SparqlUpdateParser();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlParameterizedString cmdString = new SparqlParameterizedString();<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmdString.CommandText = @&quot;INSERT DATA { [ &lt;http://mapping/left&gt; &quot;&quot;item1&quot;&quot;; &lt;http://mapping/right&gt; &quot;&quot;item2&quot;&quot; ] }&quot;;<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlUpdateCommandSet cmds = parser.ParseFromString(cmdString);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LeviathanUpdateProcessor processor = new LeviathanUpdateProcessor(tripleStore);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; processor.ProcessCommandSet(cmds);<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RdfXmlWriter rdfXmlWriter = new RdfXmlWriter();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rdfXmlWriter.Save(graph, @&quot;c:\mapping1.xml&quot;);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rdfXmlWriter.Save(graph, @&quot;c:\mapping.xml&quot;);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // second pass - read file and add a new blank node<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IGraph graph = new Graph();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TripleStore tripleStore = new TripleStore();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tripleStore.Add(graph);<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RdfXmlParser rdfXmlParser = new RdfXmlParser();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rdfXmlParser.Load(graph, @&quot;c:\mapping.xml&quot;);<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlUpdateParser parser = new SparqlUpdateParser();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlParameterizedString cmdString = new SparqlParameterizedString();<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmdString.CommandText = @&quot;INSERT DATA { [ &lt;http://mapping/left&gt; &quot;&quot;item3&quot;&quot;; &lt;http://mapping/right&gt; &quot;&quot;item4&quot;&quot; ] }&quot;;<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SparqlUpdateCommandSet cmds = parser.ParseFromString(cmdString);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LeviathanUpdateProcessor processor = new LeviathanUpdateProcessor(tripleStore);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; processor.ProcessCommandSet(cmds);<br />
	<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RdfXmlWriter rdfXmlWriter = new RdfXmlWriter();<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rdfXmlWriter.Save(graph, @&quot;c:\mapping.xml&quot;);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rdfXmlWriter.Save(graph, @&quot;c:\mapping2.xml&quot;);<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br />
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</p>
<p>
	&nbsp;</p>
<p>
	The first run produces</p>
<p>
	&lt;rdf:RDF xmlns:rdfs=&quot;http://www.w3.org/2000/01/rdf-schema#&quot; xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema#&quot; xmlns:rdf=&quot;http://www.w3.org/1999/02/22-rdf-syntax-ns#&quot;&gt;<br />
	&nbsp; &lt;rdf:Description rdf:nodeID=&quot;autos1&quot;&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns0:left xmlns:ns0=&quot;http://mapping/&quot;&gt;item1&lt;/ns0:left&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:right xmlns:ns1=&quot;http://mapping/&quot;&gt;item2&lt;/ns1:right&gt;<br />
	&nbsp; &lt;/rdf:Description&gt;<br />
	&lt;/rdf:RDF&gt;</p>
<p>
	and the second run produces incorrectly</p>
<p>
	&lt;rdf:RDF xmlns:rdfs=&quot;http://www.w3.org/2000/01/rdf-schema#&quot; xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema#&quot; xmlns:xml=&quot;http://www.w3.org/XML/1998/namespace&quot; xmlns:ns0=&quot;http://mapping/&quot; xmlns:ns1=&quot;http://mapping/&quot; xmlns:rdf=&quot;http://www.w3.org/1999/02/22-rdf-syntax-ns#&quot;&gt;<br />
	&nbsp; &lt;rdf:Description rdf:nodeID=&quot;autos1&quot;&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:left&gt;item1&lt;/ns1:left&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:left&gt;item3&lt;/ns1:left&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:right&gt;item2&lt;/ns1:right&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:right&gt;item4&lt;/ns1:right&gt;<br />
	&nbsp; &lt;/rdf:Description&gt;<br />
	&lt;/rdf:RDF&gt;</p>
<p>
	but I would expect correct</p>
<p>
	&lt;rdf:RDF xmlns:rdfs=&quot;http://www.w3.org/2000/01/rdf-schema#&quot; xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema#&quot; xmlns:xml=&quot;http://www.w3.org/XML/1998/namespace&quot; xmlns:ns0=&quot;http://mapping/&quot; xmlns:ns1=&quot;http://mapping/&quot; xmlns:rdf=&quot;http://www.w3.org/1999/02/22-rdf-syntax-ns#&quot;&gt;<br />
	&nbsp; &lt;rdf:Description rdf:nodeID=&quot;autos1&quot;&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:left&gt;item1&lt;/ns1:left&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:right&gt;item2&lt;/ns1:right&gt;<br />
	&nbsp; &lt;/rdf:Description&gt;<br />
	&nbsp; &lt;rdf:Description rdf:nodeID=&quot;autos2&quot;&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:left&gt;item3&lt;/ns1:left&gt;<br />
	&nbsp;&nbsp;&nbsp; &lt;ns1:right&gt;item4&lt;/ns1:right&gt;<br />
	&nbsp; &lt;/rdf:Description&gt;<br />
	&lt;/rdf:RDF&gt;</p>
<p>
	which is produced when the code above is run twice within one program run.</p>
<p>
	Thanks for looking at it!</p>
<p>
	&nbsp;</p>
<p>
	&nbsp;</p>
<p>
	&nbsp;</p></td>
  </tr>
</table>
<p>
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