The complete docbook specification is quite large, but not all is necessary for writing this manual. I keep a list of used markup here. If it's in this list it can be used, if it is not in this list, but it's necessary, it can be added. It has to be added in this list and configured in the style sheet too.
| abstract -- A summary |
| appendix -- An appendix in a Book or Article |
| author -- The name of an individual author |
| authorgroup -- Wrapper for author information when a document has multiple authors or collaborators |
| book -- A book |
| bookinfo -- Meta-information for a Book |
| caption -- A caption |
| classname -- The name of a class, in the object-oriented programming sense |
| chapter -- A chapter, as of a book |
| command -- The name of an executable program or other software command |
| guibutton -- The text on a button in a GUI |
| computeroutput -- Data, generally text, displayed or presented by a computer |
| copyright -- Copyright information about a document |
| emphasis -- Emphasized text |
| example -- A formal example, with a title |
| filename -- The name of a file |
| function -- The name of a function or subroutine, as in a programming language |
| guilabel -- The text of a label in a GUI |
| imagedata -- Pointer to external image data |
| imageobject -- A wrapper for image data and its associated meta-information |
| important -- An admonition set off from the text |
| itemizedlist -- A list in which each entry is marked with a bullet or other dingbat |
| listitem -- A wrapper for the elements of a list item |
| literal -- Inline text that is some literal value |
| literallayout -- A block of text in which line breaks and white space are to be reproduced faithfully |
| markup -- A string of formatting markup in text that is to be represented literally |
| mediaobject -- A displayed media object (video, audio, image, etc.) |
| member -- An element of a simple list |
| methodname -- The name of a method |
| note -- A message set off from the text |
| orderedlist -- A list in which each entry is marked with a sequentially incremented label |
| para -- A paragraph |
| part -- A division in a book |
| partinfo -- Meta-information for a Part |
| partintro -- An introduction to the contents of a part |
| programlisting -- A literal listing of all or part of a program |
| quote -- An inline quotation |
| screenshot -- A representation of what the user sees or might see on a computer screen |
| title -- The text of the title of a section of a document or of a formal block-level element |
| ulink -- A link that addresses its target by means of a URL (Uniform Resource Locator) |
| userinput -- Data entered by the user |
| varname -- The name of a variable |
| warning -- An admonition set off from the text |
| year -- The year of publication of a document |
| para -- A paragraph |