Valid Typotags Table
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 ____________________  ___________________  _______________ ____________ v14
 current (online) use  setext form          acted upon or        name of 
 of text emphasis      of same              displayed as     the typotag  ?
 ====================  ===================  =============== ============ ===
 Internet mail header  From <source>        Subject: shown    subject-tt (a)
 (start of a message)  minimal mail header  [Date: & From:]
 --------------------  -------------------  --------------- ------------ ---
 title (1 per text)   "Title                a title             title-tt (b)
 in distinct position  ====="               in chosen style
 --------------------  -------------------  --------------- ------------ ---
 heading (1+/ text)   "Subhead              a subhead         subhead-tt (c)
 in distinct position  -------"             in chosen style
 --------------------  -------------------  --------------- ------------ ---
 body text               66-char lines in-  lines undented     indent-tt (d)
 [plain not-indented]    dented by 2 space  and unfolded
 --------------------  -------------------  --------------- ------------ ---
 1+ bold word(s)           **[multi]word**  1+ bold word(s)      bold-tt (e)
 a single italic word               ~word~  1 italic word      italic-tt (f)
 1+ underlined words        [_multi]_word_  underlined text underline-tt (g)
 hypertextual 1+ word        [multi_]word_  1+ hot word(s)        hot-tt (h)
 >followed by text     >[space][text]       > [mono-spaced]   include-tt (i)
 bullet-text in pos1   *[space][text]       [bullet] [text]    bullet-tt (j)
                       `_quoted typotag!_`  `_left alone!_`     quote-tt (k)
 --------------------  -------------------  --------------- ------------ ---
 [hypertext link def] ^.. _word URL         jump to address      href-tt (l)
 [hypertext note def] ^.. _word Note:("*")  ("cause error")      note-tt (m)
 --------------------  -------------------  --------------- ------------ ---
 end of first? setext  $$ [last on a line]  [parse another]   twobuck-tt (n)
                      ^..[space][not dot]   [line hidden]    suppress-tt (o)
 logical end of text  ^..[alone on a line]  [taken note of]    twodot-tt (p)
 ====================  ===================  =============== ============ ===

 Note: only one instance of the element (c) (or, in its absence, (b)) 
    is absolutely _required_ for a text to be considered a valid setext.

 All the elements but (c) are in effect optional, not necessary for
    a setext to be declared as such.  Element (a) deals with setexts
    that arrive via email and end up being parsed (processed) as
    unedited mailbox files; fully employed the (a), (b) and (c) make
    it possible to distribute "multisetexts", i.e.  setexts with one
    additional level of logical structure (= more than one setext per
    message; more than one message in a mailbox).  If such file is
    viewed as a multisetext it will result in 3-level-outline
    structure: mail-subjects become top-level chapters, setext titles
    denote subchapters (topics) and the subheads yet finer threads
    within these (still a notch ABOVE mere "paragraphs of text"). 

 $$