Re: Could primaryKey be specified directly as a column name?

On 3 Nov 2014 11:37, "Axel Polleres" <axel.polleres@wu.ac.at> wrote:
>
> Dear Jeni, all,
>
> just a guts feeling: Things like 'primary key' are constraints on the
data. Another group is primarily concerned with constraints on data and
validation of these: http://www.w3.org/2014/data-shapes/
>
> In the F2F meeting of the DRF Data Shapes WG I noted that I would be
surprised if basic SQL constraints (like primary/foreign key constrainrs
would NOT be covered there), so likewise here I wonder whether these
constraints are something we shouldn't do in liaison with the RDF data
shapes group, rather  than specifying properties in isolation.
>
> Thoughts?

Data Shapes WG is by charter and membership wholeheartedly by/for/in RDF.
CSV WG is not. The best we can expect at this stage is to communicate,
rather than common spec IMHO.

Dan

> Axel
>
> --
> Prof. Dr. Axel Polleres
> Institute for Information Business, WU Vienna
> url: http://www.polleres.net/  twitter: @AxelPolleres
>
> On 03 Nov 2014, at 11:53, Jeni Tennison <jeni@jenitennison.com> wrote:
>
> > Hi David,
> >
> > This was an attempt to make the metadata JSON be good JSON-LD. The
draft now just uses the “name” property and references those names within
“primaryKey", which makes it easier to write but requires a bit more
application logic.
> >
> > Jeni
> >
> > -----Original Message-----
> > From: David Booth <david@dbooth.org>
> > Reply: David Booth <david@dbooth.org>>
> > Date: 1 November 2014 at 20:36:05
> > To: public-csv-wg@w3.org <public-csv-wg@w3.org>>
> > Subject:  Could primaryKey be specified directly as a column name?
> >
> >> In the 30-Oct-2014 draft at
> >> http://w3c.github.io/csvw/csv2rdf/
> >> there is a very nice, simple example in Sec 4. (Thanks for that!) But
> >> I'm wondering about one detail.
> >>
> >> Example 3 shows CSV metadata, which includes:
> >>
> >> . . .
> >> "columns": [{
> >> "@id": "_:GID",
> >> "name": "GID",
> >> "datatype": "integer"
> >> }, {
> >> . . .
> >> "primaryKey": "_:GID"
> >> }]
> >> . . .
> >>
> >> I notice that the value provided for "primaryKey" above is specified as
> >> an indirect identifier ("_:GID") for the primary key column, instead of
> >> being directly specified as the column name "GID". I assume that there
> >> is some rationale for doing it this way -- perhaps so that the metadata
> >> can specify duplicate column names, though wouldn't that be a bad use
> >> case to support? -- but it seems cumbersome and error prone. Can this
> >> be simplified to allow the "primaryKey" to be specified directly as the
> >> column name?
> >>
> >> Thanks,
> >> David
> >>
> >>
> >>
> >
> > --
> > Jeni Tennison
> > http://www.jenitennison.com/
> >
>
>