The following code fragment, from plain XeTeX source,
results in an "undefined control sequence : \XeTeX"
message. Where is \XeTeX canonically defined, please ?
Philip Taylor
\noindent {\smallit Typeset using Jonathan Kew’s \XeTeX\ in Janusz M Nowacki’s
{\smallrmat Antykwa Toruńska} with occasional deliberate bits of {\smallrmap
Antykwa Półtaw\-skiego} and quite possibly some occasional unintended fragments
of Donald Knuth’s {\smallrmcm Computer Modern}}
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