@@ -4001,6 +4001,8 @@ block][Extension: `yaml_metadata_block`]. Here is an example:
40014001 text: doi:10.234234.234/33
40024002 publisher: My Press
40034003 rights: © 2007 John Smith, CC BY-NC
4004+ ibooks:
4005+ version: 1.3.4
40044006 ...
40054007
40064008The following fields are recognized:
@@ -4066,6 +4068,16 @@ The following fields are recognized:
40664068 ~ Either `ltr` or `rtl`. Specifies the `page-progression-direction`
40674069 attribute for the [`spine` element].
40684070
4071+`ibooks`
4072+ ~ iBooks-specific metadata, with the following fields:
4073+
4074+ - `version`: (string)
4075+ - `specified-fonts`: `true`|`false` (default `false`)
4076+ - `ipad-orientation-lock`: `portrait-only`|`landscape-only`
4077+ - `iphone-orientation-lock`: `portrait-only`|`landscape-only`
4078+ - `binding`: `true`|`false` (default `true`)
4079+ - `scroll-axis`: `vertical`|`horizontal`|`default`
4080+
40694081[MARC relators]: http://loc.gov/marc/relators/relaterm.html
40704082[`spine` element]: http://idpf.org/epub/301/spec/epub-publications.html#sec-spine-elem
40714083