In the document named "XETEX, the Multilingual Lion: TEX meets Unicode
and smart font technologies", Kew mentioned the e-TEX’s typesetting
engine, saying XeTeX is in fact based on it, but I found nothing about
the e-TEX.
Is it same as PlainTeX?
I have briefly read the XeTeX Reference guid, Companion, they just
introduce the topics related to the font, what about the others?
Is XeTeX composed same as PlainTeX?
Do I have to learn TeX first?
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