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Re: XPath +/- etc not first class functions

• From: Dimitre Novatchev <dnovatchev@gmail.com>
• To: Michael Kay <mike@saxonica.com>
• Date: Mon, 28 Aug 2017 13:58:25 -0700

On Mon, Aug 28, 2017 at 1:47 PM, Michael Kay <mike@saxonica.com> wrote:
> Yes: perhaps this could be the shortest EXPath spec ever.
> Just define a binding of the op prefix to the namespace http://expath.org/ns/operators and you're done.
>

Yes, but the name

    op:numeric-add()

seems prohibitively-long and inconvenient. Kinda Hungarian notation ...

Compare to Haskell' section
(https://wiki.haskell.org/Section_of_an_infix_operator):

(+)

Seems like there is definitely considerable space for improvement


Cheers,
Dimitre

On Mon, Aug 28, 2017 at 1:47 PM, Michael Kay <mike@saxonica.com> wrote:
> Yes: perhaps this could be the shortest EXPath spec ever. Just define a binding of the op prefix to the namespace http://expath.org/ns/operators and you're done.
>
> Michael Kay
> Saxonica
>
>> On 28 Aug 2017, at 21:15, Benito van der Zander <benito@benibela.de> wrote:
>>
>> Hi,
>>
>>  perhaps there is an implementation where op:numeric-add is an actual function
>>
>> Best,
>> Benito
>>
>>
>>
>> Am 28.08.2017 um 21:37 schrieb Dimitre Novatchev:
>>> Add() and Subtract() have been part of FXSL
>>> (
>>> http://fxsl.sourceforge.net/
>>> ) since 2001.
>>>
>>> There are a lot of other useful functions in FXSL (corresponding to
>>> almost all functions in Haskell's Prelude module)  that aren't defined
>>> in the XPath/XQuery FO standard.
>>>
>>> I must find some time to produce FXSL 3 -- now when its use would be
>>> most easy in conjunction with XPath 3.
>>>
>>> Cheers,
>>> Dimitre
>>>
>>> On Sun, Aug 27, 2017 at 11:00 PM, Ihe Onwuka
>>> <ihe.onwuka@gmail.com>
>>>  wrote:
>>>
>>>> The examples at
>>>>
>>>>
>>>> https://www.w3.org/TR/xpath-functions-31/#func-fold-left
>>>>
>>>>
>>>> would seem to suggest that primitives such as + and - cannot be passed as
>>>> values.
>>>>
>>>> Correct?
>>>>
>>>
>>>
>>>
>>
>



-- 
Cheers,
Dimitre Novatchev
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• References:
  • XPath +/- etc not first class functions
    • From: Ihe Onwuka <ihe.onwuka@gmail.com>
  • Re: XPath +/- etc not first class functions
    • From: Dimitre Novatchev <dnovatchev@gmail.com>
  • Re: XPath +/- etc not first class functions
    • From: Benito van der Zander <benito@benibela.de>
  • Re: XPath +/- etc not first class functions
    • From: Michael Kay <mike@saxonica.com>