<listitem override="B"> ignored?

[Sam Steingold <sds@gnu.org>]

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It appears that override is ignored:

http://docbook.org/tdg/en/html/listitem.html
Override specifies the keyword for the type of mark to be used on this
ListItem instead of the mark currently in use for the list.

so I expected
<itemizedlist>
<listitem override="B">...
<listitem override="A">...
<listitem override="Z">...
</itemizedlist>

to be rendered

~ B. ...
~ A. ...
~ Z. ...

this expectation is reinforced by
http://docbook.org/tdg/en/html/itemizedlist.html

alas, I do not observe this, I see the standard bullets instead.

So, how do I specify the item labels in my lists?

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