Specifies the available values for PDFStandardLayoutAttribute.setRubyAlign method.
The content shall be centred in the inline-progression direction.
The content shall be expanded to fill the available width in the inline-progression direction. However, space shall also be inserted at the start edge and end edge of the text.
The content shall be aligned on the end edge in the inlineprogression direction.
The content shall be expanded to fill the available width in the inline-progression direction.
The content shall be aligned on the start edge in the inlineprogression direction.