What about null elements?

On Fri, Jul 13, 2018 at 12:11 PM Andrea Aime <[email protected]>
wrote:

> On Fri, Jul 13, 2018 at 8:41 PM, Jody Garnett <[email protected]>
> wrote:
>
>> No personal preference, just want to consider options, and wondering if
>> the design is working (or needs a workaround).
>>
>> I kind of thought we had a way to represent lists of content, indicate
>> the type of the list element, and then allow multiplicity to be zero to
>> any, nillable false.
>>
>
> The way I can think of would be to have the attribute with multiplicity >
> 1 in the schema, but then complex features would be needed
> (and hell gates would slam open, in GT we have no gentle path between
> simple and complex, there is simple, and then there is
> app-schema, nothing in between). Bridging that gap looks like to be a very
> large amount of work (e.g., for starters JDBCDataStore
> would have to become a JDBCDataAccess, with all the consequences of the
> case).
>
> With arrays there are no particular issues besides to-string (can be
> solved with a converter), the type is explicit enough that client
> code can determine what to put in the attributes for writes, and it's a
> 1-1 match for the database type (it's called an array in there).
> If it was read only I would be happy with a type-less list, but since
> writes are a requirement, the caller code needs enough info
> to determine what to put in the features to be written. Adding some info
> in the userdata map is possible, but it looks like a hack,
> compared to having direct type representation.
>
> Cheers
> Andrea
>
> ==
>
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