XML文件的解析库，支持XPath，类似Python的lxml库中的etree。代码示例：use etree::*;use std::path::Path;fn modify_xml(path_in:P, path_out:P) { let mut tree = ETree::parse_file(path_in); let subtree_pos = tree.find("//CHILD-A").unwrap(); let mut subtree = tree.subtree(subtree_pos); let subtree_child_pos = subtree.find("/SUBCHILD-A").unwrap(); if let Some(node) = subtree.node_mut(subtree_child_pos) { node.set_text("WEST"); } // tree.append_next_tree(subtree_pos, subtree.clone()); let parent_pos = tree.parent(subtree_pos).unwrap(); tree.append_child_tree(parent_pos, subtree); tree.write_file(path_out).ok();}