<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type='text/xsl' href='third.xsl'?>
<excelfile>
  <row>
    <link value="http://www.gismeteo.ru">text</link>
    <text>text 21</text>
    <link value="http://www.google.com">test</link>
    <categories>
      <category id="1" title="aaaaa"/>
      <category id="2" title="bbbbb"/>
      <category id="3" title="cccc cc"/>
      <category id="4" title="ddd fffff"/>
    </categories>
  </row>
  <row>
    <link/>
    <text>google</text>
    <link/>
</excelfile>

 public final static String XPATH_SELECTOR_PREFIX = "//row[./text[contains(.,'";
    public final static String XPATH_SELECTOR_POSTFIX = "')]]";

static String FilterXML(Document document, String matchingText) {
        XPath xpathSelector = DocumentHelper.createXPath(
                XPATH_SELECTOR_PREFIX + matchingText + XPATH_SELECTOR_POSTFIX);
List<Node> listNodes = xpathSelector.selectNodes(document);
        Document resultDocument = DocumentHelper.createDocument();
        Element rootElement = resultDocument.addElement("excelfile");
        for (Node node : listNodes) {
            node.setParent(null);
            rootElement.add(node);
        }

public final static String XPATH_DROP_SELECTOR = "//category/.";

 XPath droplistSelector = DocumentHelper.createXPath(XPATH_DROP_SELECTOR);
        List<Node> dropNodes = droplistSelector.selectNodes(document);
        Document droplistDocument = DocumentHelper.createDocument();
        Element droplistElement = droplistDocument.addElement("categories");
        for (Node node : dropNodes) {
            node.setParent(null);
            droplistElement.add(node);
        }

    <categories>
      <category id="1" title="aaaaa"/>
      <category id="2" title="bbbbb"/>
      <category id="3" title="cccc cc"/>
      <category id="4" title="ddd fffff"/>
    </categories>

 <row>
    <link/>
    <text>google</text>
    <link/>
<categories>
      <category id="1" title="aaaaa"/>
      <category id="2" title="bbbbb"/>
      <category id="3" title="cccc cc"/>
      <category id="4" title="ddd fffff"/>
</categories>
  </row>