Re: ✅ Literals as subjects Re: Toward easier RDF: a proposal

On 2018年11月22日, 05:04 Tim Berners-Lee <timbl@w3.org wrote:
>
>
> On 2018-11 -21, at 22:40, David Booth <david@dbooth.org> wrote:
>
> 7. Literals as subjects. RDF should allow "anyone to say
> anything about anything", but RDF does not currently allow
> literals as subjects! (One work-around is to use -- you guessed
> it -- a blank node, which in turn is asserted to be owl:sameAs
> the literal.) This deficiency may seem unimportant relative
> to other RDF difficulties, but it is a peculiar anomaly that
> may have greater impact than we realize. Imagine an *average*
> developer, new to RDF, who unknowingly violates this rule and
> is puzzled when it doesn't work. Negative experiences like
> that drive people away. Even more insidiously, imagine this
> developer tries to CONSTRUCT triples using a SPARQL query,
> and some of those triples happen to have literals in the
> subject position. Per the SPARQL standard, those triples will
> be silently eliminated from the results,[13] which could lead
> to silently producing wrong answers from the application --
> the worst of all possible bugs.
>
>
> Agreed.
>
> I thought we had fixed that in some later spec but I guess not.
>
https://www.w3.org/TR/rdf11-concepts/#section-generalized-rdf is the
closest afaik, maybe parts of the Semantics and SPARQL specs are quietly
permissive too, I forget...
All code I have written, like cwm and rdflib.js, allows the same things in
> subject and object positions. Life is too short for arbitrary unnecessary
> asymmetry.
>
> timbl
>
>