title: How do I add RDF triples to Blazegraph?
body: <p>I am trying to add this simple example of RDF:</p>
  
  <pre><code>&lt;rdf:RDF&gt;
  &lt;rdf:Description&gt;
  &lt;rdf:subject resource="http://www.w3.org/Home/Lassila"/&gt;
  &lt;rdf:predicate resource="http://description.org/schema/Creator"/&gt;
  &lt;rdf:object&gt;Ora Lassila&lt;/rdf:object&gt;
  &lt;rdf:type resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement"/&gt;
  &lt;a:attributedTo&gt;Ralph Swick
  &lt;/a:attributedTo&gt;           
  &lt;/rdf:Description&gt;             
  &lt;/rdf:RDF&gt;
  </code></pre>
  
  <p>into the Blazegraph triple store, but I am getting the following error:</p>
  
  <pre><code>ERROR: INSERT-WITH-BODY: baseURI=http://localhost:9999/bigdata/namespace/undefined/sparql, context-uri=[]  
  java.util.concurrent.ExecutionException:     com.bigdata.rdf.sail.webapp.DatasetNotFoundException: Not found: namespace=undefined 
  at java.util.concurrent.FutureTask.report(FutureTask.java:122) 
  at java.util.concurrent.FutureTask.get(FutureTask.java:188) 
  at com.bigdata.rdf.sail.webapp.InsertServlet.doPostWithBody(InsertServlet.java:203) 
  at com.bigdata.rdf.sail.webapp.InsertServlet.doPost(InsertServlet.java:119) 
  at com.bigdata.rdf.sail.webapp.RESTServlet.doPost(RESTServlet.java:272)      
  at com.bigdata.rdf.sail.webapp.MultiTenancyServlet.doPost(MultiTenancyServlet.java:144) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
  at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769) 
  at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) 
  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
  </code></pre>
  
  <p>As far as I know, I am keeping a close check at namespace.</p>
  
  <p>I have also tried this example:</p>
  
  <pre><code>prefix dcterm: &lt;http://purl.org/dc/terms/&gt;
  prefix dc: &lt;http://purl.org/dc/elements/1.1/&gt;
  &lt;?xml version="1.0"?&gt;
  &lt;rdf:RDF
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:dc="http://purl.org/metadata/dublin_core#"&gt; 
  &lt;rdf:Description about="http://www.foo.com/cool.html"&gt; 
    &lt;dc:Creator&gt;
      &lt;rdf:Seq ID="CreatorsAlphabeticalBySurname"&gt;
        &lt;rdf:li&gt;Mary Andrew&lt;/rdf:li&gt;
        &lt;rdf:li&gt;Jacky Crystal&lt;/rdf:li&gt;
      &lt;/rdf:Seq&gt;
    &lt;/dc:Creator&gt;
  
    &lt;dc:Identifier&gt;
      &lt;rdf:Bag ID="MirroredSites"&gt; 
        &lt;rdf:li rdf:resource="http://www.foo.com.au/cool.html"/&gt;
        &lt;rdf:li rdf:resource="http://www.foo.com.it/cool.html"/&gt;
      &lt;/rdf:Bag&gt;
    &lt;/dc:Identifier&gt;
  
    &lt;dc:Title&gt;
      &lt;rdf:Alt&gt;
        &lt;rdf:li xml:lang="en"&gt;The Coolest Web Page&lt;/rdf:li&gt;
        &lt;rdf:li xml:lang="it"&gt;Il Pagio di Web Fuba&lt;/rdf:li&gt;
      &lt;/rdf:Alt&gt;
    &lt;/dc:Title&gt;
  &lt;/rdf:Description&gt; 
  </code></pre>
  
  <p></p>