Xpath expression don't work

Question

i need to select two "sect" by idtry {
            // parse the XML as a W3C Document
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = builder.parse(new File("book1.xml"));
            XPath xpath = XPathFactory.newInstance().newXPath();
            String expression = "//chapter/sect[@id='secC'] | //chatpter/sect[@id='secA']"; //select two attributes (this don't works, why?)
            // obtain the element as a node.
            Node node = (Node)xpath.evaluate(expression, doc, XPathConstants.NODE);but using the same Xpath expression on xsl the expressions works
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:template match="/">
        <xsl:copy-of select="//chapter/sect[@id='secB']| //chapter/sect[@id='secC']"/> 
    </xsl:template>
</xsl:stylesheet>may xml file <chapter id="chapter1">
        <sect id="secA">
                <para id="a1">texto a1.</para>
                <para id="a2">texto a2.</para>
                <para id="a3">texto a3.</para>
        </sect>
        <sect id="secB">
                <para id="b1">texto b1.</para>
                <para id="b2">texto b2.</para>
                <para id="b3">texto b3.</para>
        </sect>
<sect id="secC">
                <para id="c1">texto b1.</para>
                <para id="c2">texto b2.</para>
                <para id="c3">texto b3.</para>
        </sect>
</chapter>can anyone help?

Answer 1

The result of the query consists of two nodes. If you want to access both of them, use the NodeList type in place of the Node type:NodeList nodeList = (NodeList)xpath.evaluate(expression, doc, XPathConstants.NODESET);