如何将节点值从一个xml文档添加到另一个xml文档？

import xml.etree.ElementTree as ET

def add_node_value(source_xml_path, target_xml_path, source_node_xpath, target_node_xpath):
    # 解析源XML文档和目标XML文档
    source_tree = ET.parse(source_xml_path)
    target_tree = ET.parse(target_xml_path)

    # 定位源节点
    source_node = source_tree.find(source_node_xpath)
    if source_node is None:
        raise ValueError("Source node not found in the source XML document.")

    # 提取节点值
    node_value = source_node.text

    # 定位目标节点
    target_node = target_tree.find(target_node_xpath)
    if target_node is None:
        raise ValueError("Target node not found in the target XML document.")

    # 创建新节点
    new_node = ET.Element(source_node.tag)
    new_node.text = node_value

    # 将新节点添加到目标节点
    target_node.append(new_node)

    # 保存目标XML文档
    target_tree.write(target_xml_path)

# 示例用法
add_node_value("source.xml", "target.xml", "path/to/source/node", "path/to/target/node")