docbook message

Subject: How do I tell keycap+ from keycap keypad+

From: Krzysztof =?utf-8?q?=C5=BBelechowski?= <giecrilj@stegny.2a.pl>
To: docbook@lists.oasis-open.org
Date: Thu, 13 Jan 2011 15:57:47 +0100

How do I tell

 <keycap >+</keycap >

from 

 <keycap >+</keycap >

where one of them is in the keypad and should be rendered with a gray background?

Chris

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  - From: Krzysztof =?utf-8?q?=C5=BBelechowski?= <giecrilj@stegny.2a.pl>