The ('correct') semantic markup of a BC should be based on what the BC primarily 'means'.
There is the distinction between BC as a presentation format (navigation in a line suggesting a progression from left-to-right) vs. BC-as-a-transcript (similar to the Back button) of the path the specific user followed to reach this page.
Finally there is the companion term 'topic path'; often presented as a breadcrumb, that show the current page in relation to an information hierarchy or structure (the taxonomy defense).
More thoughts: http://www.motive.co.nz/glossary/breadcrumb.php
<aside>Suggestions regarding additional glossary terms we should add welcome</aside>.
-- Andy Kirkwood | Creative Director
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