Changes

A typical use of Unicode blocks is in the definition of '''fallback''' fonts to provide glyphs for certain characters. Sometimes, when writing a document in ConTeXt, one needs to typeset special symbols that are not available in the base font of the document. In such a situation, one can specify a fallback font to provide these missing symbols.  For example, in the following document, the base font [[TeX Gyre|TeX Gyre Pagella]] does not have the glyphs for Cyrillic characters, whose code points are in the Unicode block {{code|Cyrillic}}. The document uses the {{cmd|definefallbackfamily}} command to get the missing glyphs for this block from the {{code|DejaVu Serif}} font. The ConTeXt name of the block is supplied as the value of the key {{code|range}} in the last setup of the command.

\definefallbackfamily [mainface] [serif] [DejaVu Serif] [range=cyrillic,force=yes]

\rightaligned{--- — Lewis Caroll, Jabberwocky} 

\rightaligned {--- — Дина Григорьевна Орловская, Бармаглот}

Another use of fallback fonts arises when one wants to replace the glyphs for some characters in the base font with glyphs for those characters from another font. In such a case, the latter font can be specified as a fallback font.