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[Bug 29918] [FO31] map:find ordering constraint prevents streaming evaluation

From: <bugzilla@jessica.w3.org>
Date: Mon, 31 Oct 2016 18:01:54 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29918-523-gjOgy92FBh@http.www.w3.org/Bugs/Public/>

--- Comment #2 from Michael Kay <mike@saxonica.com> ---
I'm not convinced that there is a requirement for streamed evaluation of maps,
since I think they are by their nature direct-access data structures. However,
if we accept this requirement we could change the rule to read:

To process an item that is a map, then for each key-value entry (K, V) in the
map (in ·implementation-dependent· order), perform both the following steps, in

 a. If K is the same key as $key, then add V as a new member to the end of the
result array.

 b. Process V (which is, in general, a sequence).

We could also relax the rules on ordering further, but this goes explicitly
against a previous decision of the WG which wanted the order to be as
predictable as possible.

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