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[Bug 22732] [F+O 3.0] Function-lookup and the dynamic context

From: <bugzilla@jessica.w3.org>
Date: Fri, 19 Jul 2013 07:49:10 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-22732-523-lX9cDuD3PW@http.www.w3.org/Bugs/Public/>

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
To restore what I think we intended when we wrote this rule, I suggest we
change it to say:

If the function that is retrieved by fn:function-lookup has *dynamic*
dependencies on the static or dynamic context....

and then think about how to define what "dynamic dependencies" are. What we
want here is to allow static binding to the things that you would normally
expect to be statically bound (like namespaces), and dynamic binding to the
things that can't be statically bound (like a decimal format, or a collation
whose value is not known until run-time.)

I can't think of any way of doing this other than enumerating which context
dependencies are considered dynamic. This might not be easy: for example the
collation name in "order by" is fixed statically, and we would presumably like
to bind it statically, whereas collation names passed to functions are in
general only known dynamically.

For variables (consider my original example) there is the complication that we
would really like f to be able to bind both to the (static) declaration of $v,
and to its (dynamic) value (3). This is tricky to achieve because our current
semantics for variable references speak as if we did a run-time lookup of the
variable name.

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