如何在Swift中使用XPath将XMLDocument拆分成较小的部分进行处理？

import Foundation
import XMLParsing

let xmlString = """
<root>
    <element1>Value 1</element1>
    <element2>Value 2</element2>
    <element3>Value 3</element3>
</root>
"""

guard let data = xmlString.data(using: .utf8) else {
    print("Failed to convert XML string to data")
    return
}

guard let xmlDoc = try? XMLDocument(data: data) else {
    print("Failed to create XML document")
    return
}

let xpath = "//element1 | //element2" // 选择element1和element2节点

guard let elements = try? xmlDoc.nodes(forXPath: xpath) else {
    print("Failed to execute XPath query")
    return
}

for element in elements {
    if let elementNode = element as? XMLElement {
        // 处理每个节点
        let name = elementNode.name
        let value = elementNode.stringValue
        print("Node name: \(name), Value: \(value)")
    }
}