title: Creating collections in SOLR
body: <p>On the web searching for collections in SOLR i found only information about distributed search and so on but when  I understand the concept of correclty collections are running on the same server instance using the same schema but are logically completely separated. Is this correct?
  So I can have 3 collections and searching on one collection won´t output results of another right? Would it be <em>possible</em> to search on more than one collection at once?</p>
  
  <p>But my main priority: How do I create a second collection? Even a link to a good doc would be appreciated.
  In my solr.xml i have</p>
  
  <pre><code>  &lt;cores adminPath="/admin/cores" defaultCoreName="web-collection" host="${host:}" hostPort="${jetty.port:}"&gt;
      &lt;core name="web-collection" instanceDir="." /&gt;
    &lt;/cores&gt;
  </code></pre>
  
  <p>Would it be sufficient to create a second core-entry and set different paths? like...</p>
  
  <pre><code>  &lt;cores adminPath="/admin/cores" defaultCoreName="web-collection" host="${host:}" hostPort="${jetty.port:}"&gt;
      &lt;core name="web-collection" instanceDir="web" /&gt;
      &lt;core name="test-collection" instanceDir="test" /&gt;
    &lt;/cores&gt;
  </code></pre>
  
  <p>What is the instanceDir about? Is it the index-directory relative to SOLR-Home?</p>