man.charmap.subset.profile
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## Name

man.charmap.subset.profile — Profile of character map subset

## Synopsis

    <xsl:param name="man.charmap.subset.profile">
    @*[local-name() = 'block'] = 'Miscellaneous Technical' or
    (@*[local-name() = 'block'] = 'C1 Controls And Latin-1 Supplement (Latin-1 Supplement)' and
     @*[local-name() = 'class'] = 'symbols'
    ) or
    (@*[local-name() = 'block'] = 'General Punctuation' and
     (@*[local-name() = 'class'] = 'spaces' or
      @*[local-name() = 'class'] = 'dashes' or
      @*[local-name() = 'class'] = 'quotes' or
      @*[local-name() = 'class'] = 'bullets'
     )
    ) or
    @*[local-name() = 'name'] = 'HORIZONTAL ELLIPSIS' or
    @*[local-name() = 'name'] = 'WORD JOINER' or
    @*[local-name() = 'name'] = 'SERVICE MARK' or
    @*[local-name() = 'name'] = 'TRADE MARK SIGN' or
    @*[local-name() = 'name'] = 'ZERO WIDTH NO-BREAK SPACE'
    </xsl:param>

## Description

If the value of the `man.charmap.use.subset` parameter is non-zero, The character-map subset specified by the `man.charmap.subset.profile` parameter is used instead of the full roff character map.

The value of `man.charmap.subset.profile` is a string representating an XPath expression that matches attribute names and values for `output-character` elements in the character map.

The attributes supported in the standard roff character map included in the distribution are:

character
  a raw Unicode character or numeric Unicode character-entity value (either in decimal or hex); all characters have this attribute
name
  a standard full/long ISO/Unicode character name (e.g., "OHM SIGN"); all characters have this attribute
block
  a standard Unicode "block" name (e.g., "General Punctuation"); all characters have this attribute. For the full list of Unicode block names supported in the standard roff character map, see the section called “Supported Unicode block names and "class" values”.
class
  a class of characters (e.g., "spaces"). Not all characters have this attribute; currently, it is used only with certain characters within the "C1 Controls And Latin-1 Supplement" and "General Punctuation" blocks. For details, see the section called “Supported Unicode block names and "class" values”.
entity
  an ISO entity name (e.g., "ohm"); not all characters have this attribute, because not all characters have ISO entity names; for example, of the 800 or so characters in the standard roff character map included in the distribution, only around 300 have ISO entity names.
string
  a string representating an roff/groff escape-code (with "@esc@" used in place of the backslash), or a simple ASCII string; all characters in the roff character map have this attribute

The value of `man.charmap.subset.profile` is evaluated as an XPath expression at run-time to select a portion of the roff character map to use. You can tune the subset used by adding or removing parts. For example, if you need to use a wide range of mathematical operators in a document, and you want to have them converted into roff markup properly, you might add the following:

      @*[local-name() = 'block'] ='MathematicalOperators'

That will cause a additional set of around 67 additional "math" characters to be converted into roff markup.

Depending on which XSLT engine you use, either the EXSLT `dyn:evaluate` extension function (for xsltproc or Xalan) or `saxon:evaluate` extensio function (for Saxon) are used to dynamically evaluate the value of `man.charmap.subset.profile` at run-time. If you don't use xsltproc, Saxon, Xalan -- or some other XSLT engine that supports `dyn:evaluate` -- you must either set the value of the `man.charmap.use.subset` parameter to zero and process your documents using the full character map instead, or set the value of the `man.charmap.enabled` parameter to zero instead (so that character-map processing is disabled completely.

An alternative to using `man.charmap.subset.profile` is to create your own custom character map, and set the value of `man.charmap.uri` to the URI/filename for that. If you use a custom character map, you will probably want to include in it just the characters you want to use, and so you will most likely also want to set the value of `man.charmap.use.subset` to zero.

You can create a custom character map by making a copy of the standard roff character map provided in the distribution, and then adding to, changing, and/or deleting from that.

If you author your DocBook XML source in UTF-8 or UTF-16 encoding and aren't sure what OSes or environments your man-page output might end up being viewed on, and not sure what version of nroff/groff those environments might have, you should be careful about what Unicode symbols and special characters you use in your source and what parts you add to the value of `man.charmap.subset.profile`.

Many of the escape codes used are specific to groff and using them may not provide the expected output on an OS or environment that uses nroff instead of groff.

On the other hand, if you intend for your man-page output to be viewed only on modern systems (for example, GNU/Linux systems, FreeBSD systems, or Cygwin environments) that have a good, up-to-date groff, then you can safely include a wide range of Unicode symbols and special characters in your UTF-8 or UTF-16 encoded DocBook XML source and add any of the supported Unicode block names to the value of `man.charmap.subset.profile`.

For other details, see the documentation for the `man.charmap.use.subset` parameter.

### Supported Unicode block names and "class" values

Below is the full list of Unicode block names and "class" values supported in the standard roff stylesheet provided in the distribution, along with a description of which codepoints from the Unicode range corresponding to that block name or block/class combination are supported.

- C1 Controls And Latin-1 Supplement (Latin-1 Supplement) (x00a0 to x00ff)

  class values

  - symbols

  - letters

- Latin Extended-A (x0100 to x017f, partial)

- Spacing Modifier Letters (x02b0 to x02ee, partial)

- Greek and Coptic (x0370 to x03ff, partial)

- General Punctuation (x2000 to x206f, partial)

  class values

  - spaces

  - dashes

  - quotes

  - daggers

  - bullets

  - leaders

  - primes

- Superscripts and Subscripts (x2070 to x209f)

- Currency Symbols (x20a0 to x20b1)

- Letterlike Symbols (x2100 to x214b)

- Number Forms (x2150 to x218f)

- Arrows (x2190 to x21ff, partial)

- Mathematical Operators (x2200 to x22ff, partial)

- Control Pictures (x2400 to x243f)

- Enclosed Alphanumerics (x2460 to x24ff)

- Geometric Shapes (x25a0 to x25f7, partial)

- Miscellaneous Symbols (x2600 to x26ff, partial)

- Dingbats (x2700 to x27be, partial)

- Alphabetic Presentation Forms (xfb00 to xfb04 only)

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