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+-----------------------------------------------------------------------------+
|                                 indexformat                                 |
+-----------------------------------------------------------------------------+
 
Abbreviation:  ã|\ixfã%
 
Parameters:    ã|submarkupã%
 
Submarkup:     ã|\respectcase, \style, \leadering, \everyhang,
\everyletterbreak, \indentsubentry, \everyindexã%
 
    ã|Description:ã%
The  defaults listed  above for  each markup  applies  initially to  each of
the  three indexes.    One  or more  indexes'  defaults can  all  be changed
by  modifying the  \indexformat markup.    The  complete description  of the
\indexformat markup and its related submarkup is:
 
\indexformatn{format}
 
where n is the index (1, 2, or 3) and format is the submarkup.
 
ã|respectcaseã% ignores the case of an index entry.  This markup can only be
used within the \indexformat markup.   If you wanted case respected and have
the lower  case letters sorted before  the upper case  entries (i.e., "boat"
sorted before "Bed") then enter
 
\respectcase{yes}
 
    ã|Notes:ã%
Respecting  case applies  to all  letters.    If \respectcase{yes}  has been
specified, then  "boat" and  "cat" will both  be sorted  before "Bed".   The
default value is \respectcase{no} for each of the 3 indexes.
 
ã|styleã% regulates the general  index format.  \style{indent}, the default,
indents each index entry.  This style looks like:
 
+-----------------------------------------------------------------------------+
|                                                                             |
|     Constantinople, 12, See also Istanbul                                   |
|      alien rule of, 20                                                      |
|      Arab invasion of, 19, 31                                               |
|      Crusades and, 22, 57                                                   |
|      Ottoman conquest of, 29--31                                            |
|                                                                             |
+-----------------------------------------------------------------------------+
 
    There are two other styles to choose from:  "paragraph" and "dash".  The
style "paragraph" is a run-on hanging paragraph.  You get it by specifying:
 
\indexformat1{\style{paragraph}}
 
With this style, the above index would look like:
 
+-----------------------------------------------------------------------------+
|                                                                             |
| Constantinople,  12,  alien  rule                                           |
|  of,  20, Arab  invasion  of, 19,                                           |
|  31,   Crusades  and,   22,   57,                                           |
|  Ottoman conquest of, 29--31, See                                           |
|  also Istanbul                                                              |
|                                                                             |
+-----------------------------------------------------------------------------+
 
Note that  with this style,  the blind entry from  the \blindentry submarkup
comes after the  subentry, instead of  after the main entry  as was done for
the "indent" style.
    The third style is "dash", an em-dash style.  You get it by specifying
 
\indexformat1{\style{dash}}
 
It is  very similar  to the  default "indent"  style, except  subentries are
prefaced with an em dash following the initial indent of space.
 
+-----------------------------------------------------------------------------+
|                                                                             |
|     Constantinople, 12, See also Istanbul                                   |
|      ---alien rule of, 20                                                   |
|      ---Arab invasion of, 19, 31                                            |
|      ---Crusades and, 22, 57                                                |
|      ---Ottoman conquest of, 29--31                                         |
|                                                                             |
+-----------------------------------------------------------------------------+
 
ã|leaderingã%  turns on/off  dot leadering.    The default  is  "off".   You
can change  this default only within  the \indexformat markup.   To have dot
leadering, enter:
 
\ixf1{\leadering{yes}}
 
If you are using \style{indent} and \leadering{yes} you get:
 
+-----------------------------------------------------------------------------+
|                                                                             |
|     Constantinople,    See   also                                           |
| Istanbul  ... . ...  ... . ....12                                           |
|      alien rule of  ... . ...  20                                           |
|      Arab invasion of . . .19, 31                                           |
|      Crusades and  .... . .22, 57                                           |
|      Ottoman conquest of  .29--31                                           |
|                                                                             |
+-----------------------------------------------------------------------------+
 
    ã|Notes:ã%
Do not use dot leadering with \style{paragraph}.
 
ã|everyletterbreakã%  is what  will be  printed  between each  letter break,
(i.e.   between "A"  and "B").  By default, one  blank line  is skipped when
starting a new letter (at  each letter break).  The \everyletterbreak markup
can only appear within the \indexformat markup.
 
    ã|Example:ã%
You could modify the default to place a rule and skip between breaks:
 
\ixf1{\everyletterbreak{\vs{\bl}
                         \hrule width 2in
                         \vs{\bl}}}
 
    This would look something like:
 
+-----------------------------------------------------------------------------+
|                                                                             |
| .....................                                                       |
| alpha, 62                                                                   |
| America, 38                                                                 |
| Austria, 55                                                                 |
| .....................                                                       |
|                                                                             |
| Bach, 98                                                                    |
| Bethlehem, 87                                                               |
|                                                                             |
+-----------------------------------------------------------------------------+
 
    ã|Example:ã%
Something else you  can do with indexes is to  make use of the "\nextletter"
submarkup, which gives  you the next uppercase character  about to be listed
in the  sorted index  list.   For  example, between  "apple" and  "boat" the
value of "\nextletter"  would be "B". One application  would be to print the
"\nextletter" in a  large type.  This could  be accomplished by changing the
default for "\everyletterbreak" to:
 
\indexformat{\everyletterbreak{\vs{\bl}
     \noindent{\twelvepoint\bd\nextletter}\par}}
 
The resulting index would look like:
 
+-----------------------------------------------------------------------------+
|                                                                             |
|                                                                             |
|    A                                                                        |
|    alpha, 62                                                                |
|    America, 38                                                              |
|    Austria, 55                                                              |
|                                                                             |
|    B                                                                        |
|    Bach, 98                                                                 |
|    Bethlehem, 87                                                            |
+-----------------------------------------------------------------------------+
 
    ã|Example:ã%
Another  variation of  the above  would be  to draw  a  box around  the next
letter.  You could do this by adding \drawbox to \everyletterbreak:
 
\ixf1{\everyletterbreak{\vs{\bl}
         \drawbox{\bd\nextletter}\par}}
 
and you will get an index that prints as illustrated on the next page.
 
+-----------------------------------------------------------------------------+
|                                                                             |
|     .....                                                                   |
|     .....                                                                   |
|     alpha, 62                                                               |
|     America, 38                                                             |
|     Austria, 55                                                             |
|                                                                             |
|     .....                                                                   |
|     .....                                                                   |
|     Bach, 98                                                                |
|     Bethlehem, 87                                                           |
|                                                                             |
+-----------------------------------------------------------------------------+
 
    ã|Notes:ã%
The "\nextletter" is always an uppercase letter.
    Only letters,  not numbers or  special characters such  as the backslash
(\) are used as \nextletter.
 
ã|indentsubentryã% There are two levels of subentries available.  The amount
of distance  they are  indented when  you are  using the "indent"  or "dash"
styles is  controlled by the  \indentsubentry submarkup.   If  you are using
the "paragraph"  style for the index,  the \indentsubentry is ignored.   The
definition of this markup is,
 
\ixf1{\indentsubentryn{amt}}
 
where n is the subentry level, 1 or 2, and amt is the amount to be indented.
The default indent for these two subentry levels is:
 
\ixf1{\indentsubentry1{1em}
      \indentsubentry2{2em}}
 
    If, for  example, you  were using the  "indented" style  and wanted each
subentry level indented two em's from the previous level, you would enter,
 
\ixf1{\indentsubentry1{2em}
      \indentsubentry2{4em}}
 
which would print the index illustrated earlier as:
+-----------------------------------------------------------------------------+
|                                                                             |
|     Constantinople, 12, See also Istanbul                                   |
|       alien rule of, 20                                                     |
|       Arab invasion of, 19, 31                                              |
|       Crusades and, 22, 57                                                  |
|       Ottoman conquest of, 29--31                                           |
|                                                                             |
+-----------------------------------------------------------------------------+
 
ã|everyhangã% controls  the hanging indent  for the primary  index level and
each of the two  subentry levels.  If you had  an index entry with many page
numbers,
 
+-----------------------------------------------------------------------------+
|                                                                             |
| Write  state-                                                               |
|  ment,    26,                                                               |
|  34--38,  70,                                                               |
|  86,                                                                        |
|  103,    191,                                                               |
|  202,   203--                                                               |
|  204, 281                                                                   |
|                                                                             |
+-----------------------------------------------------------------------------+
 
The hangingindent would be 1.5em by default.
 
    ã|Example:ã%
If you wanted to increase that value to 3em, you would enter,
 
\ixf1{\everyhang{3em}}
 
and you would get:
 
+-----------------------------------------------------------------------------+
|                                                                             |
| Write  state-                                                               |
|    ment,  26,                                                               |
|    34--38,                                                                  |
|    70,    86,                                                               |
|    103,  191,                                                               |
|    202, 203--                                                               |
|    204, 281                                                                 |
|                                                                             |
+-----------------------------------------------------------------------------+
 
ã|everyindexã%  is a  list of  one or  more commands  to be  executed before
printing the sorted index.  By default, \tenpt is the value of \everyindex.
 
    ã|Notes:ã%
The default type style used with \monospace is \roman instead of \tenpt.