If you want to turn a text document into SGML to port it to other formats, this is the way to go:
        <!doctype linuxdoc system>
         <article>
          <title>Title Goes Here</title>
          <author>
           name of author, author's e-mail, etc.
          </author>
          <date>
           version and date 
          </date>
       
       <abstract> and </abstract> tags.
       <toc> tag, which stands for Table
Of Contents. 
       <sect>The Title Of The Chapter
       
and add the </sect> tag at the end of the
chapter.Note : You don't have to put the chapter number, this is done automatically.
<sect1>
and they end with </sect1>.
<sectn> and </sectn> where
n= 2, 3, or 4 in a similar way.
<p>
tag.
<it> and </it>
(italics), <bf> and </bf>
(bold face), or <tt> and </tt>
(typewriter style).
        This is a four lines list:
         - first line goes here
         - second line comes next
         - yet another one
         - that's it.
       
       
you must replace it with:
       
        This is a four lines list:
       <itemize>
       <item>first line goes here
       <item>second line come next
       <item>yet another one
       <item>that's it.
       </itemize>
        
       <verb>
        10 REM Oh my God what's this?
        20 REM I thought this had long disappeared!
        30 PRINT "I am back to";
        40 PRINT "save the world."
        50 INPUT "From whom, do you reckon? ",M$
        60 IF M$="Bill" THEN PRINT "Thou art wise.":GOTO PARADISE
        70 ELSE PRINT "You ain't got a clue...":GOTO RICHMOND
        </verb>