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<fn> and occurence



Hello, All.
This example is from manual
    <apply>
      <fn occurrence="infix"><mo>&PlusMinus;</mo></fn>
      ...

but in chap4_1.html said that 'occurrence' attribute may be used only
with <declare>. 
In this case we may write just <fn><mo>&PlusMinus;</mo></fn> because
PlusMinus is listed in dictionary. 
So, we may accept the 'occurrence' attribute in <fn>.
But if I want to write n@ in content murkup (n factorial, but for '!'
we use '@') I will fail because there is no predefined value 'postfix'
for the occurrence attribute.

And second.
What should we render if we see
<apply>
 <fn>
  <mo>&SomeInfixOrPostfixOperator;</mo>
 </fn>
 <ci>x</ci>
</apply>?
Should we use the default value occurrence="Function-model" or use
'form' of operator?

I have many more questions on this topic.
May be someone have FAQ on it? ;-)

Kostya
 
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