Re: [Asdf] Composing sdfThings

[Ari Keränen <[e-mail]>]

Here's another strawman, based on Carsten's example, of a potential design with array of sdfObjects:
https://github.com/one-data-model/exploratory/blob/master/sdfThing/fridgemultifreezer.sdf.json

It uses new "minItems" and "maxItems" qualities (similar to JSO min/maxItems for array type) to define how many freezer Objects can there be in the Thing.

This seems like a reasonable design, but there are still open questions like how to address those objects. One option is to use JSON pointer array syntax, e.g., a pointer to the 7th freezer object could look like:
#/sdfThing/FridgeMulti-freezer/sdfObject/freezer/6

However, given the definition is not an actual array (it's JSON object with two new qualities), something like additional processing steps on the model would need to be applied before the JSON pointers can be used as such.

Another question is whether we should have minItems quality or should we use only sdfRequired also here. Unless we want to invent new wildcard syntax for sdfRequired, seems that sdfRequired would need to have separate pointer for each required instance. That could result in excessively large sdfRequired blocks so minItems seems like a reasonable shorthand for that.


Cheers,
Ari

On 29.3.2021, 19.13, "ASDF" <[e-mail]> wrote:
> 
> After today’s OneDM discussion, I put together a quick strawman that shows how to put together a fridge-freezer out of two refrigeration components.
> 
> https://github.com/one-data-model/exploratory/blob/master/sdfThing/fridgefreezer.sdf.json
> 
> This demonstrate static named composition.
> It does not show how to do Ari’s use case of numbered composition (an array of sdfThings or sdfObjects in an sdfThing).
> It also doesn’t demonstrate dynamic composition.
> 
> Grüße, Carsten
>