Any xlink experts out there?

In short, I am trying to support thumbnails and image maps using xlink using

xmlns:xlink CDATA "http://www.w3.org/1999/xlink"
xlink:type (simple) "simple"
xlink:href CDATA #IMPLIED
xlink:role CDATA #IMPLIED
xlink:title CDATA #IMPLIED
xlink:show (new | replace | embed | other | none) #IMPLIED
xlink:actuate (onload | onrequest) #IMPLIED

Does anyone have a good example(s) of DTD and XML instance that demonstrate this implementation or can you point me to a good resource(s) for information?

If not xlink--how do you support thumbnails and image maps in your implementations?

Here are a couple of ideas

<!-- example method 1 -->
<Link xlink:href="./image.jpg" ... >
<Image xlink:href="./thumb/image.jpg" ... />
</Link>

<!-- memics HTNL -->


<!-- example method 2 - METS-like -->
<MediaResource>
<Image type="thumbres" xlink:href="./thumb/image.jpg" ... />
<Image type="normalres" xlink:href="./image.jpg" ... />
</MediaResource>

<!-- verbose -->


<!-- example method 3 -->
<Image imageID="./thumb/image.jpg" xlink:href="./image.jpg" ... />

<!--
The disadvatage to this method is that the additional details
such as title or alternate text (represented by "...") can
only be about one image or the other -- not both.

Additionally, xlink:href can sometime represent the inline
image and other times imageID does.
--->