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  * metacatread.html
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  *
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  *      Authors: Jivka Bojilova
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  *    Copyright: 2000 Regents of the University of California and the
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  *               National Center for Ecological Analysis and Synthesis
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  *  For Details: http://www.nceas.ucsb.edu/
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  *      Created: 2000 April 5
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  *      Version: 0.01
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  *    File Info: '$Id: metacatgetlog.html 3780 2008-04-02 23:28:31Z daigle $'
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  * 
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  * October Meeting SDSC, 2000
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<HTML>
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<TITLE>Metacat</TITLE>
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<link rel="stylesheet" type="text/css" href="./default.css">
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</HEAD> 
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<BODY>
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  <table width="100%">
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    <tr>
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      <td class="tablehead" colspan="2"><p class="label">Metacat
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       getlog action</p></td>
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       <td class="tablehead" colspan="2" align="right">
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       </td>
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    </tr>
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  </table>
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  <p>
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	The Metacat servlet provides an 'action' for retrieving a log of the
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        events that have occurred, including document insertions, updates,
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        deletes, and reads.  This allows a simple reporting facility where
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        event reports can be output in XML format.  The report can be subset to
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        only include events from a particular IP address, user, event type,
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        after a start date, or before an end date.
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  </p>
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  <p>
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	The basic log can be viewed using the <code>getlog</code> servlet 
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	action, as in the following URL:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog</code>
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  </p>
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  <p>
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  	This will return an XML formatted log of all events since the log was
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	initiated, which can be quite extensive.  To subset the report, provide
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        parameters to restrict the set of matching events:
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        <ul>
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        <li>ipAddress -- restrict the report to this ipAddress (repeatable)</li>
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        <li>principal -- restrict the report to this principal (repeatable)</li>
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        <li>docid -- restrict the report to this docid (repeatable)</li>
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        <li>event -- restrict the report to this event type (repeatable)
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            <ul>
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            <li><code>insert</code></li>
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            <li><code>update</code></li>
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            <li><code>delete</code></li>
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            <li><code>read</code></li>
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            </ul>
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        </li>
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        <li>start -- restrict the report to events after this date
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            <ul>
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            <li><code>YYYY-MM-DD+hh:mm:ss</code></li>
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            </ul>
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        </li>
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        <li>end -- restrict the report to events before this date
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            <ul>
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            <li><code>YYYY-MM-DD+hh:mm:ss</code></li>
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            </ul>
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        </li>
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        </ul>
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  </p>
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  <p>
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	Some example queries follow.  To view only the 'read' events, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&event=read</code>
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  </p>
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  <p>
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	To view only the events for a particular IP address, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&ipaddress=107.9.1.31</code>
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  </p>
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  <p>
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	To view only the events for a given user, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&principal=uid=johndoe,o=NCEAS,dc=ecoinformatics,dc=org</code>
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  </p>
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  <p>
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	To view only the events for a particular document, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&docid=knb.5.1</code>
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  </p>
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  <p>
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	To view only the events after a given date, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&start=2004-09-15+12:00:00</code>
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  </p>
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  <p>
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	To view only the events before a given date, use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&end=2004-09-15+12:00:00</code>
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  </p>
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  <p>
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	Query parameters can be combined, so to view the 'insert' events for September 2004 use a url like:<br>
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     	<code>http://some.metacat.host/context/metacat?action=getlog&event=insert&start=2004-09-01+12:00:00&end=2004-09-30+23:59:59</code>
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  </p>
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  <p>
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	The log is returned in XML format.  Here is an example log format:<br>
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        <pre>
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&lt;?xml version="1.0"?&gt;
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&lt;log&gt;
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&lt;logEntry&gt;&lt;entryid&gt;44&lt;/entryid&gt;&lt;ipAddress&gt;34.237.20.142&lt;/ipAddress&gt;&lt;principal&gt;uid=jones,o=NCEAS,dc=ecoinformatics,dc=org&lt;/principal&gt;&lt;docid&gt;esa.2.1&lt;/docid&gt;&lt;event&gt;insert&lt;/event&gt;&lt;dateLogged&gt;2004-09-08 19:08:18.16&lt;/dateLogged&gt;&lt;/logEntry&gt;
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&lt;logEntry&gt;&lt;entryid&gt;47&lt;/entryid&gt;&lt;ipAddress&gt;34.237.20.142&lt;/ipAddress&gt;&lt;principal&gt;uid=jones,o=NCEAS,dc=ecoinformatics,dc=org&lt;/principal&gt;&lt;docid&gt;esa.3.1&lt;/docid&gt;&lt;event&gt;insert&lt;/event&gt;&lt;dateLogged&gt;2004-09-14 19:50:40.61&lt;/dateLogged&gt;&lt;/logEntry&gt;
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&lt;/log&gt;
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        </pre>
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