What does "title" mean in generate.toc entries

[David Cramer <david@thingbag.net>]

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I've long wondered about this. In the param generate.toc, what does
"title" do in an entry like the following:

article		toc,title

See:
http://docbook.sourceforge.net/release/xsl/1.76.1/doc/html/generate.toc.html

Thanks,
David
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