在SCALA中使用Xpath修改XML

Question

对于下面给出的XML，

val doc =
<library>
  <videos>
    <vid>Head</vid>
    <video type="dvd">Seven</video>
    <video type="blue-ray">The fifth element</video>
    <video type="hardcover">Gardens of the moon</video>
  </videos>
  <books>
    <book type="softcover">Memories of Ice</book>
  </books>
</library>

需要更改XPATH中的内容： doc\\("videos")\\("vid")为<video type="usb">one</video>

因此，期望的输出是

<library>
  <videos>
    <video type="usb">one</video>
    <video type="dvd">Seven</video>
    <video type="blue-ray">The fifth element</video>
    <video type="hardcover">Gardens of the moon</video>
  </videos>
  <books>
    <book type="softcover">Memories of Ice</book>
  </books>
</library>

欢迎使用XPATH修改XML内容的任何想法！