java xpath expression get only value if child node is different

Question

I woudlike to get one specific value of node if child node is different like present in my expression :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = factory.newDocumentBuilder();
 document = builder.parse(new File("test.xml")); 

List<String> data = new ArrayList<>();
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate("/name1/type/*[name()!= 'pmc']", document, XPathConstants.NODESET);
        for (int i = 0; i < nodes.getLength(); i++) {
            Element el = (Element) nodes.item(i);
            data.add(el.getAttribute("id"));
        }

System.out.println(data);

test.xml :

<?xml version="1.0" encoding="UTF-8"?>
<name1>
    <type id ="1">
        <coord>67</coord>
        <lmc>57657</lmc>
    </type>
    <lang>
        <eng>989</eng>
        <spa>123</spa>
    </lang>
</name1>
<name2>
    <type id ="2">
        <coord>534</coord>
        <lmc>654654</lmc>
    </type>
    <lang>
        <eng>354</eng>
        <spa>2424</spa>
    </lang>
</name2>
<name3>
    <type>
        <coord>23432</coord>
        <pmc>14324</pmc>
    </type>
    <lang>
        <eng>141</eng>
        <spa>142</spa>
    </lang>
</name3>

For example I wouldlike to get only the id if the childnode is 'pmc' and not the others.

Answer 1

Since the question isn't entirely clear, let's try it this way.

Assuming that your xml reads like this:

<?xml version="1.0" encoding="UTF-8"?>
<name1>
    <type id ="1">
        <coord>67</coord>
        <lmc>57657</lmc>
    </type>
    <lang>
        <eng>989</eng>
        <spa>123</spa>
    </lang>
</name1>
<name2>
    <type id ="2">
        <coord>534</coord>
        <lmc>654654</lmc>
    </type>
    <lang>
        <eng>354</eng>
        <spa>2424</spa>
    </lang>
</name2>
<name3>
    <type id ="3">
        <coord>23432</coord>
        <pmc>14324</pmc>
    </type>
    <lang>
        <eng>141</eng>
        <spa>142</spa>
    </lang>
</name3>

and that you are trying to get the value of the attribute <id> of any <type> node which has a <pmc> child node, try using the following as your xpath expression:

//*/type[pmc]/@id