[XeTeX] XeTeX does not define the \XeTeX macro.

[Philip TAYLOR]

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}}