[1] CI Plus Specification. Content Security Extensions to the Common Interface ( 版) <http://www.ci-plus.com/data/ci-plus_specification_v1.3.pdf#page=145>
CIEngineProfile1 has full conformance with D-Book 5.0 [23], section 15. except as documented in the
following sections. These replace sections 15.3.1 and 15.3.1.1 in D-Book 5.0.
The character repertoire of CIEngineProfile1 shall minimally be the character repertoire of UKEngineProfile1
when the resident font is used. The MHEG application may use other characters that are available in an
alternative character set after first confirming the presence of the character set in rec://font/xxx, where
xxx is the required character set.
CIEngineProfile1 has a font attribute class of "rec://font/CI1".
Downloaded fonts may have a wider character repertoire and all characters in a downloaded font shall be
supported.