[xquery-talk] set as datatype in xquery

[Adam Retter]

Okay I see what you are getting at but in light of the fact that there is
not a set type, but there is an array type, could you not just use the
array type with the XPath 3.1 function arrays:for-each?

Regards polluting your code, you would only have that if you chose to
access the array by index, instead you could just stick to for-each.

Well, I see an array as a specialized dataSet.
>
> I see an array is an indexed, c.q. subscripted, dataset.
>
> Or I see a dataset is an array without the indexing-mechanism.
>
> Or you could also see a dataset as an map without the mapping-mechanism.
>
> What remains is a dynamic set with data-items where the items can
> individually be processed, e.g. by a for-each function, but not
> individually be addressed.
>
>
>
> Using arrays as datasets pollutes my code with its addressing mechanism.
>
> Especially for a function language expressiveness of the language should
> be one of the highest goods.
>
>
>
> Rob
>
>
>
> *Van:* Adam Retter [mailto:adam.retter at googlemail.com]
> *Verzonden:* zondag 19 juli 2015 12:02
> *Aan:* Rob Stapper
> *CC:* talk at x-query.com
> *Onderwerp:* Re: [xquery-talk] set as datatype in xquery
>
>
>
> Can you tell me how you see a dataSet being different to an array?
>
>
>
> On 19 July 2015 at 10:27, Rob Stapper <r.stapper at lijbrandt.nl> wrote:
>
> Hello,
>
>
>
> Is it an option to add a “dataSet” as datatype in xquery, like for example
> the “array”?
>
> My case is that I’m having this high-order function that iterates through
> a sequence and start a given function on each item until it receives back
> an ‘nothing’, than it breaks off.
>
> This works great except with sequences which I ( have to) use for
> “dataSets”: there are occasions that I need to return an empty set without
> breaking of the iteration.
>
> In xquery there are empty arrays, empty maps and empty elements but no
> empty “dataset”, like - set {} -
>
>
>
> Thanx,
>
>
>
> Rob Stapper
>
>
>
> PS.
>
> - definition for “dataset” could be something like: - a datatype
> representing a dynamic collection of data-items –.
>
>
>
> - Since the “dataSet” is an datatype, “dataSets” could hold other dataSets.
>
> - Function “for-each” (  no particular sequence) could take a “dataset”
> but “fold-left” and “fold-right” ( particular sequence) could not.
>
> - I don’t know if a “fold”-function ( no particular sequence) would make
> sense, haven’t thought about it enough.
>
>
>
>
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>
> Adam Retter
>
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Adam Retter

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