[m-rev.] for post-commit review: clean up extras/xml

[Zoltan Somogyi]

For review by anyone.

Can anyone propose better names for the following predicates
in parsing.m?

- "then", which prompted the email about funny syntax on m-users;

- lit, whose two different arity variants should have different names;

- lit1, whose two different arity variants should also have different names,
  and a base name that differs from lit by more than one digit whose meaning
  is neither obvious nor documented;

- x

Zoltan.
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