[xquery-talk] FW: set as datatype in xquery

[Rob Stapper]

Van: Rob Stapper [mailto:r.stapper at lijbrandt.nl] 
Verzonden: zondag 19 juli 2015 15:10
Aan: 'Adam Retter'
Onderwerp: RE: [xquery-talk] set as datatype in xquery

 

Sure I can do that because after all an array is a glorified dataset. But I won’t J.

Question is: does the W3C as a standardization-organization, want its product to settle for a workaround like that?

 

Van: talk-bounces at x-query.com [mailto:talk-bounces at x-query.com] Namens Adam Retter
Verzonden: zondag 19 juli 2015 13:54
Aan: Rob Stapper
CC: talk at x-query.com
Onderwerp: Re: [xquery-talk] set as datatype in xquery

 

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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