如何使用Xpath java仅在同级中查找节点？

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import java.io.File;

public class XPathExample {
    public static void main(String[] args) {
        try {
            // 加载XML文件
            File xmlFile = new File("example.xml");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(xmlFile);

            // 创建XPath对象
            XPathFactory xPathFactory = XPathFactory.newInstance();
            XPath xPath = xPathFactory.newXPath();

            // 编译XPath表达式
            XPathExpression xpathExpression = xPath.compile("//parent/child");

            // 在同级中查找节点
            Node currentNode = (Node) xpathExpression.evaluate(document, XPathConstants.NODE);
            if (currentNode != null) {
                // 获取同级节点集合
                NodeList siblings = (NodeList) xpathExpression.evaluate(currentNode.getParentNode(), XPathConstants.NODESET);
                for (int i = 0; i < siblings.getLength(); i++) {
                    Node sibling = siblings.item(i);
                    // 处理同级节点
                    System.out.println(sibling.getNodeName());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}