(Auszug aus "XSL-FO ― Die Referenz" von Manuel Montero Pineda & Steffen Herkert, 2016, dpunkt.verlag)
Specifies the alternative glyph of a character.
|Value:||<number> | <string> <number>?|
|Applies to:||all block-level and inline-level formatting objects|
Values have the following meanings.
|<number>||Specifies the order of the alternative glyph. 0 is a standard glyph. When the specified order is beyond the number of the glyph which is contained in the font, it is regarded as 0.|
|<string>||Specifies the tag of OpenType GSUB feature. If omitted, it is regarded as aalt. <number> is required or not required depending on the tag. When <number> is omitted even if it's necessary, it is regarded as 1. The following tags can be specified.
Some of the OpenType fonts have some alternative glyphs against a certain glyph. In such a font, a glyph can be chosen with the alt-glyph property. AH Formatter V6.3 doesn't offer the method to investigate what type and how many glyphs are contained. It is applied only to the script associated with Kanji, Hiragana, Katakana, Latin, Greek, Cyrillic and Number.