babel-doc: adding information on hlines colnames and rownames header args

doc/org.texi

@@ -11312,6 +11312,9 @@ argument.
 * session::
 * noweb::
 * cache::
+* hlines::
+* colnames::
+* rownames::
 @end menu
 
 @node var, results, , Specific Header arguments
@@ -11722,7 +11725,7 @@ Note that noweb replacement text that does not contain any newlines will not
 be affected by this change, so it is still possible to use inline noweb
 references.
 
-@node cache, , noweb, Specific Header arguments
+@node cache, hlines, noweb, Specific Header arguments
 @subsubsection cache
 Controls the use of in-buffer caching of source code block results to avoid
 re-running unchanged source code blocks.  This header argument can have one
@@ -11740,6 +11743,133 @@ executions of the source code block.  If the source code block has not
 changed since the last time it was evaluated, it will not be re-evaluated.
 @end itemize
 
+@node hlines, colnames, cache, Specific Header arguments
+@subsubsection hlines
+Tables are frequently represented with one or more horizontal lines, or
+hlines.  The @code{:hlines} argument to an Org-babel code block accepts the
+values @code{yes} or @code{no}, with a default value of @code{no}.
+
+@itemize @bullet
+@item @code{no}
+Strips horizontal lines from the input table.  In most languages this is the
+desired effect because an @code{hline} symbol is interpreted as an unbound
+variable and raises an error.  Setting @code{:hlines no} or relying on the
+default value yields the following results.
+
+@example
+#+tblname: many-cols
+| a | b | c |
+|---+---+---|
+| d | e | f |
+|---+---+---|
+| g | h | i |
+
+#+source: echo-table
+#+begin_src python :var tab=many-cols
+  return tab
+#+end_src
+
+#+results: echo-table
+| a | b | c |
+| d | e | f |
+| g | h | i |
+@end example
+
+@item @code{yes}
+Leaves hlines in the table. Setting @code{:hlines yes} has this effect.
+
+@example
+#+tblname: many-cols
+| a | b | c |
+|---+---+---|
+| d | e | f |
+|---+---+---|
+| g | h | i |
+
+#+source: echo-table
+#+begin_src python :var tab=many-cols :hlines yes
+  return tab
+#+end_src
+
+#+results: echo-table
+| a | b | c |
+|---+---+---|
+| d | e | f |
+|---+---+---|
+| g | h | i |
+@end example
+@end itemize
+
+@node colnames, rownames, hlines, Specific Header arguments
+@subsubsection colnames
+The @code{:colnames} header argument accepts the values @code{yes},
+@code{no}, or @code{nil} for unassigned.  The default value is @code{nil}.
+
+@itemize @bullet
+@item @code{nil}
+If an input table /looks like/ it has column names
+(because its second row is an hline), then the column
+names will be removed from the table by Org-babel before
+processing, then reapplied to the results.
+
+@example
+#+tblname: less-cols
+| a |
+|---|
+| b |
+| c |
+  
+#+srcname: echo-table-again
+#+begin_src python :var tab=less-cols
+  return [[val + '*' for val in row] for row in tab]
+#+end_src
+
+#+results: echo-table-again
+| a  |
+|----|
+| b* |
+| c* |
+@end example
+
+@item @code{no}
+No column name pre-processing takes place
+
+@item @code{yes}
+Column names are removed and reapplied as with @code{nil} even if the table
+does not /look like/ it has column names (i.e. the second row is not an
+hline)
+@end itemize
+
+@node rownames, , colnames, Specific Header arguments
+@subsubsection rownames
+The @code{:rownames} header argument can take on the values @code{yes}
+or @code{no}, with a default value of @code{no}.
+
+@itemize @bullet
+@item @code{no}
+No row name pre-processing will take place.
+
+@item @code{yes}
+The first column of the table is removed from the
+table by Org-babel before processing, and is then reapplied
+to the results.
+
+@example
+#+tblname: with-rownames
+| one | 1 | 2 | 3 | 4 |  5 |
+| two | 6 | 7 | 8 | 9 | 10 | 
+
+#+srcname: echo-table-once-again
+#+begin_src python :var tab=with-rownames :rownames yes
+  return [[val + 10 for val in row] for row in tab]            
+#+end_src
+
+#+results: echo-table-once-again
+| one | 11 | 12 | 13 | 14 | 15 |
+| two | 16 | 17 | 18 | 19 | 20 |
+@end example
+@end itemize
+
 @node Results, Noweb reference syntax, Header arguments, Working With Source Code
 @section Results
 The way in which results are handled depends on whether a session is invoked,