Link: Big Dog: Today's Class.
The customerHTML it looks like connects them all together. What is the root.xsl function? Is it the HTML part?
Yes, it provides the html part. Try reading through the handout pages as they give more details. There is also this w3 schools site that works well for learning html.
I realize people must be struck by all of the moving parts (xml you generated, html you may not know, the way of generating one from the other using xslt). I do not expect html expertise coming in. Personally, I am not an html expert. I just learn what I have to to get results.