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[Bug 29586] [XP31] 2.5.6.2 The judgement subtype-itemtype(Ai, Bi)

From: <bugzilla@jessica.w3.org>
Date: Thu, 26 May 2016 09:36:23 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29586-523-tlS5S6rMHm@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=29586

--- Comment #19 from John Snelson <john.snelson@marklogic.com> ---
(In reply to Tim Mills from comment #18)
> (In reply to John Snelson from comment #17)
> > (In reply to Tim Mills from comment #16)
> > > In "2.5.5.8 Map Test", replace the text
> > > 
> > > "The function signature of the map, ... the required return type."
> > > 
> > > with
> > > 
> > > "The function signature of a map matching type map(K, V), treated as a
> > > function, is function(xs:anyAtomicType) as V?.  It is thus always a subtype
> > > of function(xs:anyAtomicType) as item()* regardless of the actual types of
> > > the keys and values in the map.
> > 
> > I think this text is unclear what to do in the case where no static typing
> > information is available. We need that case to be the default, and for the
> > text to allow a better type (a subtype of map(K,V)).
> 
> If the processor has sufficient information available (e.g. it knows that
> the item matches type map(K, V), it can avoid coercion.  Otherwise (it only
> knows that the item is map(*), it has to be pessimitic and introduce
> coercion.  However, from the point of view of the user, there is no
> observable difference.

I think we agree on the principle. I just think the text doesn't explain it
very well.

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Received on Thursday, 26 May 2016 09:36:27 UTC

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