在BIM360 Docs API中，导出带有标记的文档可以通过以下步骤来实现：

1. 首先，确保您已经获得了有效的访问令牌（access token）以调用API。

2. 使用以下代码示例来调用GET projects/:project_id/items/:item_id/versions/:version_id/relationships/refs接口，获取文档的关联关系：

import requests

base_url = "https://developer.api.autodesk.com/bim360/docs/v1"
project_id = ""
item_id = ""
version_id = ""
access_token = ""

url = f"{base_url}/projects/{project_id}/items/{item_id}/versions/{version_id}/relationships/refs"

headers = {
    "Authorization": f"Bearer {access_token}",
    "Content-Type": "application/json"
}

response = requests.get(url, headers=headers)

refs = response.json()["data"]

3. 使用以下代码示例来调用GET projects/:project_id/items/:item_id/tip接口，获取文档的最新版本信息：

url = f"{base_url}/projects/{project_id}/items/{item_id}/tip"

response = requests.get(url, headers=headers)

tip_version_id = response.json()["data"]["id"]

4. 使用以下代码示例来调用GET projects/:project_id/items/:item_id/versions/:version_id/relationships/refs/:ref_id/relationships/rel/refs_export接口，导出带有标记的文档：

ref_id = ""

url = f"{base_url}/projects/{project_id}/items/{item_id}/versions/{tip_version_id}/relationships/refs/{ref_id}/relationships/rel/refs_export"

params = {
    "export_type": "pdf",
    "views": "marked"
}

response = requests.get(url, headers=headers, params=params)

export_url = response.json()["data"]["meta"]["links"]["self"]["href"]

5. 最后，您可以使用导出链接下载导出的带有标记的文档：

download_url = f"{base_url}/{export_url}"

response = requests.get(download_url, headers=headers, stream=True)

with open("", "wb") as file:
    for chunk in response.iter_content(chunk_size=8192):
        file.write(chunk)

请确保您替换代码示例中的、、、和为实际的值，并将替换为您希望保存导出文档的文件路径。

希望这可以帮助您解决问题！