Elements that are good to know

Element Description
literallayout A block of text in which line breaks and white space are to be reproduced faithfully.
acronym For an acronym such as XML.
application Name of an application such as MS Word.
citetitle Title of a book, film, musical work, etc.
filename File names
computeroutput Computer output. Every characters are monospaced.
userinput For things a user types.
guibutton Name of a button in a graphical user interface.
guiicon Name of an icon in a graphical user interface.
guilabel Name of a label in a graphical user interface.
guimenu Name of a menu in a graphical user interface.
If you add id='S' attribute to a given step, you can refer to that step elsewhere using <xref linkend='S'/>.
List of terms and their definitions.

http://www.ibiblio.org/godoy/sgml/docbook/howto/writing-docbook.html http://www.docbook.org/docs/transclusion/