The <imagemap> element supports the basic
functionality of the HTML "client-side" image map markup.
<imagemap> allows you to designate a linkable area or
region over an image, allowing a link in that region to display another topic.
For elements that are sorted, the <sort-as> element provides
text that is combined with the base sort phrase to construct the effective sort phrase.
can be specified in the content of the <sort-as> element or in the
@value attribute on the <sort-as> element. The
<sort-as> element is useful for elements where the base sort phrase is
inadequate or non-existent, for example, a glossary entry for a Japanese Kanji