NAME

       mdbFontset - Fontset

DESCRIPTION

       The m17n library loads a fontset definition from the m17n database by the tags <fontset,
       FONTSET-NAME>. The plist format of the data is as follows:

       FONTSET ::= PER-SCRIPT * PER-CHARSET * FALLBACK *

       PER-SCRIPT ::= '(' SCRIPT PER-LANGUAGE + ')'

       PER-LANGUAGE ::= '(' LANGUAGE FONT-SPEC-ELEMENT + ')'

       PER-CHARSET ::= '(' CHARSET FONT-SPEC-ELEMENT + ')'

       FALLBACK ::= FONT-SPEC-ELEMENT

       FONT-SPEC-ELEMENT ::= '(' FONT-SPEC [ FLT-NAME ] ')'

       FONT-SPEC ::=
            '(' [ FOUNDRY FAMILY
                  [ WEIGHT [ STYLE [ STRETCH [ ADSTYLE ]]]]]
                REGISTRY
            [ OTF-SPEC ] [ LANG-SPEC ] ')'

       SCRIPT is a symbol of script name (e.g. latin, han) or nil. LANGUAGE is a two-letter
       symbol of language name code defined by ISO 639 (e.g. ja, zh) or nil.

       FONT-SPEC is to specify properties of a font. FOUNDRY to REGISTRY are symbols
       corresponding to #Mfoundry to #Mregistry property of a font. See m17nFont for the meaning
       of each property.

       OTF-SPEC is a symbol specifyng the required OTF features. The symbol name has the
       following syntax.

         OTF-SPEC-NAME ::= ':otf=' SCRIPT LANGSYS ? GSUB-FEATURES ? GPOS-FEATURES ?

         SCRIPT ::= SYMBOL
         LANGSYS ::= '/' SYMBOL

         GSUB-FEATURES ::= '=' FEATURE-LIST ?

         GPOS-FEATURES ::= '+' FEATURE-LIST ?

         FEATURE-LIST ::= '~' ? FEATURE ( ',' '~' ? FEATURE ',' ).fi

       Here, FEATURE is a four-letter Open Type feature.

       LANG-SPEC is a symbol specifying the required language support. The symbol name has the following syntax.

         LANG-SPEC-NAME ::= ':lang=' LANG

       Here, LANG is a two or three-letter ISO-639 language code.

       FLT-NAME is a name of Font Layout Table (Font Layout Table).

EXAMPLE

       This is an example of PER_SCRIPT.

       (han
         (ja
           ((jisx0208.1983-0)))
         (zh
           ((gb2312.1980-0)))
         (nil
           ((big5-0))))

       It instructs the font selector to use a font of registry 'jisx0208.1983-0' for a 'han'
       character (i.e. a character whose #Mscript property is 'han') if the character has
       #Mlanguage text property 'ja' in an M-text and the character is in the repertories of such
       fonts. Otherwise, try a font of registry 'gb2312.1980-0' or 'big5-0'. If that 'han'
       character does not have #Mlanguage text property, try all three fonts.

       See the function mdraw_text() for the detail of how a font is selected.

COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology
       (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of
       the GNU Free Documentation License <http://www.gnu.org/licenses/fdl.html>.