As I said calibre uses type="cover" in the guide to point to the cover image and type="titlepage" (spelling is correct) to point to the HTML file that contains the cover image. This is something used INTERNALLY by calibre during processing. There is no relevant standard, indeed this usage existed long before EPUB existed. And the EPUB standard speaks about type="title-page" (note the hyphen) not type="titlepage" anyway.
I dont know what all this verbiage is hoping to accomplish. But, to reduce confusion, I have changed the TEXT label of the type="titlepage" item to "Cover page".
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