如何在PowerPoint和office.js中使用自定义xml？

// 获取当前幻灯片的自定义XML部件
Office.context.document.customXmlParts.getByNamespaceAsync("your-namespace", function (result) {
    if (result.status === Office.AsyncResultStatus.Succeeded) {
        var customXmlPart = result.value[0];
        // 在自定义XML部件中查找指定的节点
        customXmlPart.getNodesAsync("/root/element", function (result) {
            if (result.status === Office.AsyncResultStatus.Succeeded) {
                var nodes = result.value;
                // 处理自定义XML节点
                for (var i = 0; i < nodes.length; i++) {
                    var node = nodes[i];
                    // 获取节点的属性值
                    var attributeValue = node.getAttribute("attribute-name");
                    // 更新节点的文本内容
                    node.setXmlText("new-text");
                }
                // 保存自定义XML部件的更改
                customXmlPart.saveAsync(function (result) {
                    if (result.status === Office.AsyncResultStatus.Succeeded) {
                        console.log("Custom XML saved successfully.");
                    } else {
                        console.log("Failed to save custom XML.");
                    }
                });
            } else {
                console.log("Failed to get custom XML nodes.");
            }
        });
    } else {
        console.log("Failed to get custom XML part.");
    }
});