[texhax] Query : why can \ifnum comparison operators not be \let, yet \def is OK ?

[William F Hammond]

Philip --

I realize that David has answered your question.

So this inquiry is based only on my curiosity.

You write in part:

> I am puzzled by the following behaviour.  All of my TeX work these days
> is XML based, which means that as soon as I am ready to \input the first
> XML file, "<" must be active.

I take this to mean that you are processing xml documents
directly in TeX.  Are you using David's xmltex or, otherwise
what?  Are your xml documents created through editing by
humans or are they generated by software?  If by editing,
what are the principal xml document types (maybe TEI ?)
being used?

Thanks for your patience with my curiosity.

                              -- Bill


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