The Amd.3 specifies additional generalized properties for the Font Resources defined by ISO/IEC 9541-1. The properties support interlinear/intercharacter font objects required for multilingual documents, particularly including East Asian language descriptions. The Ruby specified in ISO/IEC 9541-1 can be dealt with as a simplified instance of the interlinear objects as shown in Annex C of the Amd.3.
The properties of this Amd.3 are optional and in addition to those defined in ISO/IEC 9541-1, with the interchange format defined in Amd.1 to ISO/IEC 9541-2.
The Amd.3 was published in Dec. 2000.