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           The  hdtbl  macros consist of four base and three optional macros, con-
           trolled by about twenty arguments.  The syntax is simple and similar to
           the HTML table model and nearly as flexible: You can write sequences of
           tokens (macro calls with their arguments and content  data),  separated
           by  blanks  and  beginning with a macro call, into the same line to get
           compact and cleanly arrranged input.  An advantage of hdtbl is that the
           tables  are constructed without calling a preprocessor; this means that
           groff's full macro capabilities are available.  On the other hand,  ta-
           ble  processing with hdtbl is much slower than using the tbl(1) prepro-
           cessor.  A further advantage is that the HTML-like syntax of hdtbl will
           be easily converted to HTML; this is not implemented yet.


           The  simplest  well-formed  table  consists of just single calls to the
           four base table macros in the right order.  Here we construct  a  table
           with only one cell.
                  contents of the table cell
           Equivalent to the above is the following notation.
                  .TBL .TR .TD contents of the table cell .ETB
           By  default,  the formatted table is inserted into the surrounding text
           at the place of its definition.  If the  vertical  space  isn't  suffi-
           cient,  it  is  placed at the top of the next page.  Tables can also be
           stored for later insertion.
           Using 'row-number*column-number' as the data for the table cells, a ta-
           ble with two rows and two columns can be written as
                  .TBL cols=2
                  .  TR .TD 1*1 .TD 1*2
                  .  TR .TD 2*1 .TD 2*2
           Here  we see a difference to HTML tables: The number of columns must be
           explicitly specified using the 'cols=m' argument (or indirectly via the
           'width' argument, see below).
           The  contents  of  a  table  cell  is arbitrary; for example, it can be
           another table, without restriction to the nesting depth.  A given table
           layout  can  be  either constructed with suitably nested tables or with
           proper arguments to .TD and .TH, controlling column and  row  spanning.
           Note, however, that this table
           and this table
                  .TBL cols=2
                  .  TR
                  .    TD colspan=2
                  .      nop 1*1 1*2
                  .  TR
                  .    TD
                  .      nop 2*1
                  .    TD
                  .      nop 2*2
           are similar but not identical.
           Here the latter table in a more compact form.
                  .TBL cols=2 .TR ".TD colspan=2" 1*1 1*2
                  .            TR .TD 2*1 .TD 2*2 .ETB
           If a macro has one or more arguments, and it is not starting a line, it
           must be enclosed in double quotes.


           The order of macro calls and other tokens follows the HTML  model.   In
           the  following  list,  valid  predecessors  and successors of all hdtbl
           macros are given, together with the possible arguments.
           Macro arguments are separated by blanks.  The  order  of  arguments  is
           arbitrary; they are of the form
                  key='value1 [value2 [...]]'
           with  the  only  exception  of the optional argument of the macro .ETB,
           which is the string 'hold'.  Another possible form is
                  "key=value1 [value2 [...]]"
           However, this is limited to the case where the macro is the  first  one
           in the line and not already enclosed in double quotes.
           Argument  values specified below as c are colors predefined by groff or
           colors defined by the user with the .defcolor request.   Argument  val-
           ues d are decimal numbers with or without decimal point.  Argument val-
           ues m are natural numbers.  Argument values n are numerical values with
           the usual groff scaling indicators.  Some of the arguments are specific
           to one or two macros, but most of them can be specified with .TBL, .TR,
           .TD, and .TH.  These common arguments are explained in the next subsec-
                                 box border nor any horizontal or vertical separa-
                                 tor lines  between  the  table  rows  and  cells.
                                 'border=0' suppresses the surrounding box border,
                                 but still allows separator  lines  between  cells
                                 and rows.
                                 Default: 'border=.1n' (register 't*b').
                          bc=c   Border color.
                                 Default: 'bc=red4' (string 't*bc').
                          cols=m Number of table columns.  This argument is neces-
                                 sary if more than one column is in the table  and
                                 no 'width' arguments are present.
                                 Default: 'cols=1' (register 't*cols').
                          cpd=n  Cell  padding,  i.e., the extra space between the
                                 cell space border and the cell contents.
                                 Default: 'cpd=.5n' (register 't*cpd').
                          csp=n  Cell spacing, i.e., the extra space  between  the
                                 table  border  or  vertical  or  horizontal lines
                                 between cells and the cellspace.
                                 Default: 'csp=.5n' (register 't*csp').
                                 Horizontal alignment  of  the  table,  if  it  is
                                 smaller  than  the  line  width.   'tal=l':  left
                                 alignment.     'tal=c':    centered    alignment.
                                 'tal=r': right alignment.
                                 Default: 'tal=l' (register 't*tal').
                         width='w1 [w2 [...]]'
                                 Widths  of  table  cells.  w1, w2, ... are either
                                 numbers of type n or  natural  numbers  with  the
                                 pseudo-scaling  indicator  '%',  with the meaning
                                 "percent of the actual  line  length  (or  column
                                 length  for  inner  tables,  respectively)".   If
                                 there are less width values than  table  columns,
                                 the  last  width  value is used for the remaining
                                 cells.  The argument
                                        width='1.5i 10%'
                                 for example indicates that the  first  column  is
                                 1.5inches  wide;  the remaining columns take 1/10
                                 of the column length each.
                                 Default: The table width equals  the  outer  line
                                 length  or  column length; the columns have equal
                                 Height of the table.  If the table with its  con-
                                 tents  is lower than n, the last row is stretched
                                 to this value.
           .CPTN [args]
                  Text of caption.
                  The (optionally numbered) table caption.  .CPTN is optional.
                  successor: .TD, .TH
                                 The height of the row.  If a cell in the  row  is
                                 higher  than  n  this value is ignored; otherwise
                                 the row height is stretched to n.
           .TD [args [cell contents]]
                  Begin a table data cell.
           .TH [args [cell contents]]
                  Begin a table header cell.
                  Arguments and cell contents can be mixed.  The macro .TH is  not
                  really necessary and differs from .TD only in three default set-
                  tings, similar to the <TH> and <TD> HTML tags: The  contents  of
                  .TH is horizontally and vertically centered and typeset in bold-
                  predecessor: .TR, .TD, .TH, .ETB, cell contents
                  successor: .TD, .TH, .TR, .ETB, cell contents
                                 The width of this cell is the sum of  the  widths
                                 of the m cells above and below this row.
                                 The height of this cell is the sum of the heights
                                 of the m cells left and right of this column.
                                 Remark: Overlapping of column and  row  spanning,
                                 as  in the following table fragment (the overlap-
                                 ping happens in the second  cell  in  the  second
                                 row), is invalid and causes incorrect results.
                                        .TR .TD 1*1 ".TD 1*2 rowspan=2" .TD 1*3
                                        .TR ".TD 2*1 colspan=2"         .TD 2*3
           .ETB [hold]
                  End of the table.
                  This  macro  finishes  a  table.  It causes one of the following
                  ?  If the argument 'hold' is given, the table is held  until  it
                     is  freed  by calling the macro .t*free, which in turn prints
                     the table immediately, either at the current position  or  at
                     the  top  of  the  next page if its height is larger than the
                     remaining space on the page.
                  ?  Otherwise, if the table is higher than the remaining space on
                     the page, it is printed at the top of the next page.
                  ?  If  none  of  the  two  above  constraints hold, the table is
       Arguments common to .TBL, .TR, .TD, and .TH
           The arguments described in this section can be specified with the  .TBL
           and  .TR  macros, but they are eventually passed on to the table cells.
           If omitted, the defaults take place, which the user can change by  set-
           ting  the  corresponding  default  registers  or strings, as documented
           below.  Setting an argument with the .TBL macro has the same effect  as
           setting  it  for all rows in the table.  Setting an argument with a .TR
           macro has the same effect as setting it for all the .TH or .TD macro in
           this row.
                  The background color of the table cells.  This includes the area
                  specified with the 'csp'  argument.   The  argument  'bgc='  (no
                  value)  suppresses a background color; this makes the background
                  Default: 'bgc=bisque' (string 't*bgc').
           fgc=c  The foreground color of the cell contents.
                  Default: 'fgc=red4' (string 't*fgc').
                  The font family for the table.  name is one of  the  groff  font
                  families,  for example A for the AvantGarde fonts or HN for Hel-
                  Default: The font family found before the table (string 't*ff').
                  The  font style for the table.  One of R, I, B, or BI for roman,
                  bold, italic, or bboolldd iittaalliicc, respectively.  As with roff's  .ft
                  request  the 'fst' argument can be used to specify the font fam-
                  ily and font style together, for example 'fst=HNBI'  instead  of
                  'ff=HN' and 'fst=BI'.
                  Default:  The  font  style in use right before the table (string
           fsz='d1 [d2]'
                  A decimal or fractional factor d1, by which the point  size  for
                  the table is changed, and d2, by which the vertical line spacing
                  is changed.  If d2 is omitted, value d1 is taken for both.
                  Default: 'fsz='1.0 1.0'' (string 't*fsz').
                  Horizontal  alignment  of  the  cell  contents  in  the   table.
                  'hal=l': left alignment.  'hal=c': centered alignment.  'hal=b':
                  both (left and right) alignment.  'hal=r': right alignment.
                  Default: 'hal=b' (string 't*hal').
                  Vertical alignment of the cell contents in the table  for  cells
                  lower than the current row.  'val=t': alignment below the top of
                  the cell.   'val=m':  alignment  in  the  middle  of  the  cell.
                  'val=b': alignment above the cell bottom.
                  Default: 'val=t' (string 't*val').
                  Horizontal  line between the rows.  If specified with .TD or .TH
                  this is a separator line to the cell below.  'hl='  (no  value):
                  no  separator line.  'hl=s': a single separator line between the
                  rows.  'hl=d': a double separator line.
                  rator lines.  For more information see the documentation of  the
                  'hl' argument above.
                  Default: 'vl=s' (string 't*vl').


           Before creating the first table, you should configure default values to
           minimize the markup needed in each table.  The following  example  sets
           up defaults suitable for typical papers:
                  .ds t*bgc white\" background color
                  .ds t*fgc black\" foreground color
                  .ds t*bc black\"  border color
                  .nr t*cpd 0.1n\"  cell padding
           The  file  examples/common.roff  provides  another example setup in the
           ''minimal Page setup'' section.
           A table which does not fit on a partially filled page is printed  auto-
           matically  on the top of the next page if you append the little utility
           macro t*hm to the page header macro of your document's main macro pack-
           age.  For example, say
                  .am pg@top
                  .  t*hm
           if you use the ms macro package.
           The  macro  t*EM  checks  for  held or kept tables, and for missing ETB
           macros (table not closed).  You can append this macro  to  the  ''end''
           macro of your document's main macro package.  For example:
                  .am pg@end-text
                  .  t*EM
           If you use the ms macro package.


           Joachim Walsdorff


           Please send your commments to the groff mailing list or directly to the

    Groff Version 1.21 31 December 2010 GROFF_HDTBL(7)


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