— Specifies a set of string substitutions


<xsl:param name="">

  <!-- * remove no-break marker at beginning of line (stylesheet artifact) --> 
  <ss:substitution oldstring="▒▀" newstring="▒"></ss:substitution>
  <!-- * replace U+2580 no-break marker (stylesheet-added) w/ no-break space -->
  <ss:substitution oldstring="▀" newstring="\ "></ss:substitution>

  <!-- ==================================================================== -->

  <!-- * squeeze multiple newlines before a roff request  -->
  <ss:substitution oldstring="

." newstring="
  <!-- * remove any .sp instances that directly precede a .PP  -->
  <ss:substitution oldstring=".sp
.PP" newstring=".PP"></ss:substitution>
  <!-- * remove any .sp instances that directly follow a .PP  -->
  <ss:substitution oldstring=".sp
.sp" newstring=".sp"></ss:substitution>
  <!-- * squeeze multiple .sp instances into a single .sp-->
  <ss:substitution oldstring=".PP
.sp" newstring=".PP"></ss:substitution>
  <!-- * squeeze multiple newlines after start of no-fill (verbatim) env. -->
  <ss:substitution oldstring=".nf

" newstring=".nf
  <!-- * squeeze multiple newlines after REstoring margin -->
  <ss:substitution oldstring=".RE

" newstring=".RE
  <!-- * U+2591 is a marker we add before and after every Parameter in -->
  <!-- * Funcprototype output -->
  <ss:substitution oldstring="░" newstring=" "></ss:substitution>
  <!-- * U+2592 is a marker we add for the newline before output of <sbr>; -->
  <ss:substitution oldstring="▒" newstring="
  <!-- * -->
  <!-- * Now deal with some other characters that are added by the -->
  <!-- * stylesheets during processing. -->
  <!-- * -->
  <!-- * bullet -->
  <ss:substitution oldstring="•" newstring="\(bu"></ss:substitution>
  <!-- * left double quote -->
  <ss:substitution oldstring="“" newstring="\(lq"></ss:substitution>
  <!-- * right double quote -->
  <ss:substitution oldstring="”" newstring="\(rq"></ss:substitution>
  <!-- * left single quote -->
  <ss:substitution oldstring="‘" newstring="\(oq"></ss:substitution>
  <!-- * right single quote -->
  <ss:substitution oldstring="’" newstring="\(cq"></ss:substitution>
  <!-- * copyright sign -->
  <ss:substitution oldstring="©" newstring="\(co"></ss:substitution>
  <!-- * registered sign -->
  <ss:substitution oldstring="®" newstring="\(rg"></ss:substitution>
  <!-- * ...servicemark... -->
  <!-- * There is no groff equivalent for it. -->
  <ss:substitution oldstring="℠" newstring="(SM)"></ss:substitution>
  <!-- * ...trademark... -->
  <!-- * We don't do "\(tm" because for console output, -->
  <!-- * groff just renders that as "tm"; that is: -->
  <!-- * -->
  <!-- *   Product&#x2122; -> Producttm -->
  <!-- * -->
  <!-- * So we just make it to "(TM)" instead; thus: -->
  <!-- * -->
  <!-- *   Product&#x2122; -> Product(TM) -->
  <ss:substitution oldstring="™" newstring="(TM)"></ss:substitution>



The parameter contains a map that specifies a set of string substitutions to perform over the entire roff source for each man page, either just before generating final man-page output (that is, before writing man-page files to disk) or, if the value of the man.charmap.enabled parameter is non-zero, before applying the roff character map.

You can use as a “lightweight” character map to perform “essential” substitutions -- that is, substitutions that are always performed, even if the value of the man.charmap.enabled parameter is zero. For example, you can use it to replace quotation marks or other special characters that are generated by the DocBook XSL stylesheets for a particular locale setting (as opposed to those characters that are actually in source XML documents), or to replace any special characters that may be automatically generated by a particular customization of the DocBook XSL stylesheets.


Do you not change value of the parameter unless you are sure what you are doing. First consider adding your string-substitution mappings to either or both of the following parameters:

By default, both of those parameters contain no string substitutions. They are intended as a means for you to specify your own local string-substitution mappings.

If you remove any of default mappings from the value of the parameter, you are likely to end up with broken output. And be very careful about adding anything to it; it’s used for doing string substitution over the entire roff source of each man page – it causes target strings to be replaced in roff requests and escapes, not just in the visible contents of the page.

Contents of the substitution map

The string-substitution map contains one or more ss:substitution elements, each of which has two attributes:

string to replace
string with which to replace oldstring

It may also include XML comments (that is, delimited with "<!--" and "-->").