[Bug 9139] [XPath 2.1] Dynamic function calls and context

http://www.w3.org/Bugs/Public/show_bug.cgi?id=9139


Jonathan Robie <jonathan.robie@redhat.com> changed:

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--- Comment #2 from Jonathan Robie <jonathan.robie@redhat.com>  2010-02-24 18:13:17 ---
(In reply to comment #0)

> The only place where we say that the focus is cleared on a function call is in
> 3.1.5 Function Calls, rule 4:
> 
> "During evaluation of a function body, the focus (context item, context
> position, and context size) is undefined, except where it is defined by some
> expression inside the function body."
> 
> but this rule (appearing where it does) only applies to explicit calls on
> "user-declared functions": it does not apply to dynamic calls on user-declared
> functions, or to dynamic calls on inline functions, or to dynamic calls on
> built-in functions such as position(). It should apply to all these cases.

I disagree - the rules for evaluation of a dynamic function are these:

A dynamic function invocation is evaluated as follows:

1. Argument values are calculated for the function item using rules 1 and 2 for
evaluation of a function call as defined in 3.1.5 Function Calls.

2. The set of variable values from the function item's closure are added to the
dynamic context with a scope of the invocation of the function.

3. The function from the function item is evaluated using the argument values
according to rules 3 - 5 for evaluation of a function call as defined in 3.1.5
Function Calls.

When we evaluate rules 3 - 5 above, that includes rule 4, which you reference
above.


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Received on Wednesday, 24 February 2010 18:13:19 UTC