Nit: On the files in howto/ the top left "Back" link takes one to a directory listing. I suppose the right thing to do is make an index page in that directory, and I always sort of assumed there was one, although I don't know why I thought that.
Yes, a howto/index.xml should be added. I think it might also be a good idea to add a new element to the DTD -- something like <parent-document href="...">How-To</parent-document> -- that we can use both to provide the URL for the "Back" link and another level for the breadcrumb links. This would allow us to add a little more structure that is not dependent on directory-structure.
I haven't done it yet because I'm not sure how general it should be. For example, do we want to support "grandparents".
Joshua.
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