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[Sorin Marian Nasoi <sorin.marian.nasoi@xxxxxxxxx>]

> "empty" and "none" are not valid sequence types. We should try that are
> modules are at least parsable by other engines as well, so we should use valid
> sequence types.; For "empty" use empty-sequence(). 
http://www.w3.org/TR/xquery-semantics/#sec_content_models
>From this I understand that:
- The type empty matches the empty sequence.
- The type none matches no values.

>There is not a valid sequence type for "none", but I did not see it used anywhere. Do you plan to
> use it? where?
The type none is the static type for [7.2.9 The fn:error function].

> This also means that the code in translator.cpp should be removed.
So where should  
http://www.w3.org/TR/xquery-semantics/#sec_content_models
be implemented then?

Thanks for the help.
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