The documentation of Scilab must be written using the strict subset of DocBook 5 defined in doc_kit/schema/scilab.rnc. DocBook 5 elements are fully documented in "DocBook 5.0: The Definitive Guide", therefore there is not much to add here.
The root element of a document which conforms to the Scilab DocBook 5 subset must have version attribute set to "5.0-subset Scilab". Example:
<?xml version="1.0" encoding="UTF-8" ?>
<refentry version="5.0-subset Scilab"
xmlns="http://docbook.org/ns/docbook"
...The subset comprises the following elements:
book and its divisions:
part, partintro
reference
chapter, section
appendix
Meta-info elements: info, title, author, personname, affiliation, jobtitle, orgname, pubdate, keywordset, keyword.
refentry (the DocBook equivalent of a man page) and its divisions: refnamediv, refname, refpurpose, refsynopsisdiv, synopsis, refsection.
Displayed elements:
Other block-level elements:
itemizedlist, orderedlist, listitem
variablelist, varlistentry, term
simplelist, member
para
programlisting
Inline-level elements:
emphasis, literal
phrase, replaceable,
subscript, superscript
link
indexterm, primary
inlinemediaobject
inlineequation