[dotNetRDF-Develop] Issue CORE-386 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>Unexpected SPARQL results with the &quot;OPTIONAL { ... FILTER (sameTerm) } FILTER (!bound)&quot; query pattern</td>
  </tr>
  <tr>
    <td><b>Project:</b></td>
    <td>Core Library (dotNetRDF.dll)</td>
  </tr>
  <tr>
    <td><b>Created By:</b></td>
    <td>Alexandre Bouffard</td>
  </tr>
  <tr>
    <td><b>Milestone:</b></td>
    <td>Unassigned</td>
  </tr>
  <tr>
    <td><b>Category:</b></td>
    <td>Query</td>
  </tr>
  <tr>
    <td><b>Priority:</b></td>
    <td>High</td>
  </tr>
  <tr>
    <td><b>Type:</b></td>
    <td>Bug</td>
  </tr>
  <tr>
    <td><b>Description:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	Hi,</p>
<p>
	I think I found a bug related to the SPARQL query engine but I am not 100% sure.</p>
<p>
	I am computing the delta between two graphs in memory (TripleStore class) using a SPARQL query.</p>
<ul>
	<li>
		When using the MINUS operator, it works as expected.</li>
	<li>
		When using the &quot;OPTIONAL { ... FILTER (sameTerm) } FILTER (!bound)&quot; pattern, I get unexpected results under some circumstances I have not pinpointed yet</li>
</ul>
<p>
	Please see the attached unit test. Note that:</p>
<ul>
	<li>
		Expected results are obtained when removing one of the two triples from the Turtle data string.</li>
	<li>
		Expected results are obtained when asserting triples instead of parsing them (as far as I tried).</li>
</ul></td>
  </tr>
</table>
<p>
            More information on this issue can be found at
            <a href="http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=386" target="_blank">http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=386</a></p>
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