XPath如何选择注释节点？ XPath提取XML注释节点的语法与使用示例

//comment()

<!--
This is an outer comment.
  <!-- This is an inner comment. -->
-->

//comment()

<!-- This is an inner comment. -->

[contains()]

[starts-with()]

comment()

//comment()[contains(., "TODO")]

starts-with()

//comment()[starts-with(., "FIXME")]

contains()

starts-with()

translate()

//comment()[contains(translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), "todo")]

lxml

from lxml import etree

xml_string = """
<root>
  <!-- This is a comment. -->
  <element>Some text</element>
</root>
"""

root = etree.fromstring(xml_string)
comments = root.xpath("//comment()")

for comment in comments:
  print(comment.text) # 输出: This is a comment.

comment.text

javax.xml.xpath

import javax.xml.xpath.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;
import java.io.StringReader;

public class XPathExample {
    public static void main(String[] args) throws Exception {
        String xmlString = "<root><!-- This is a comment. --><element>Some text</element></root>";
        InputSource inputSource = new InputSource(new StringReader(xmlString));

        XPathFactory xpathFactory = XPathFactory.newInstance();
        XPath xpath = xpathFactory.newXPath();
        XPathExpression expr = xpath.compile("//comment()");

        NodeList nodes = (NodeList) expr.evaluate(inputSource, XPathConstants.NODESET);

        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            System.out.println(node.getNodeValue()); // 输出:  This is a comment.
        }
    }
}

node.getNodeValue()