<dd><code>parse</code> - parse data instance</dd><dd><code>url</code> - page url</dd><dd><code>datum</code> - crawl datum for the page</dd><dd><code>inlinks</code> - page inlinks</dd>
<dt><span class="strong">Returns:</span></dt><dd>modified (or a new) document instance, or null (meaning the document
 should be discarded)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/nutch/indexer/IndexingException.html" title="class in org.apache.nutch.indexer">IndexingExcep