Quoting formula "cookies" in table?

[Achim Gratz <Stromeko@nexgo.de>]

I seem to have hit a snag with tables:  I didn't find a way to quote any
of the special characters that are recognized to make formulas.  Tabbing
through such cells will create a malformed #+TBLFM: line at the end of
the table.  I can clean this up no problem, but on export the "formulas"
produce interesting results again.  Depending on the content of other
cells some lines will be moved out in front of the table.  Try HTML
subtree export on this test:

* Table Test

  |-------------+----|
  | unrelated 1 | >= |
  | Test1       | =  |
  | unrelated 2 | <= |
  | Test2       | == |
  | unrelated 3 | -= |
  | Test3       | := |
  | unrelated 4 | >= |
  | Test4       | =  |
  | unrelated 5 | <= |
  | Test5       | == |
  | unrelated 6 | -= |
  | Test6       | := |
  |-------------+----|

  |-------------+----|
  | unrelated 1 | >= |
  | Test1       | =  |
  | unrelated 2 | <= |
  | Test2       | == |
  | unrelated 4 | >= |
  | Test4       | =  |
  | unrelated 5 | <= |
  | Test5       | == |
  | unrelated 6 | -= |
  |-------------+----|

  |-------------+----|
  | unrelated 1 | XX |
  | Test1       | =  |
  | unrelated 2 | XX |
  | Test2       | == |
  | unrelated 3 | >= |
  | Test3       | := |
  | unrelated 4 | XX |
  | Test4       | =  |
  | unrelated 5 | XX |
  | Test5       | == |
  | unrelated 6 | XX |
  | Test6       | := |
  |-------------+----|

So is there a way to quote these special chars in an unobtrusive way
that cleanly exports to all backends?  If not I'd suggest to have a
special table form for "text-only" tables where these characters aren't
special (no, I don't have an idea off-hand what to use - @ in place of
the first | maybe?


Achim.
-- 
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