esource collection is a (subclass of)
 FileSet that only contains file system resources.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>rc</code> - the resource collection to check.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the collection is a fileset.</dd><dt><span class="strong">Since:</span></dt>
  <dd>Ant 1.7</dd></dl>
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<h4>getFileN