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Posted to users@jena.apache.org by "Shaw, Ryan" <ry...@unc.edu> on 2022/11/19 19:13:35 UTC

"Safe" flag for riot RDFS inference?

Currently, riot RDFS inference outputs “generalized” RDF which may not be parsable by other tools (including various Jena CLI tools). For example:

data.ttl:

```
PREFIX ex: <http://example.org/>

ex:louie ex:birthdate "2022-08-11" .
```

vocab.ttl:

```
PREFIX ex: <http://example.org/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> 

ex:birthdate rdfs:range xsd:date .

```

Output of riot --rdfs=vocab.ttl data.ttl:

```
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> 

"2022-08-11" rdf:type xsd:date .
```

… which is generalized RDF due to the literal in the subject position.

It would be nice if there were a flag to filter out such triples, so as to avoid errors when subsequently processing the output with tools that don't accept generalized RDF.

Re: "Safe" flag for riot RDFS inference?

Posted by Andy Seaborne <an...@apache.org>.

Hi Ryan,

Would you create an issue for this so it doesn't get lost? (Even better 
- with a PR)

https://github.com/apache/jena/issues

I'm not convinced it right either:

     ex:louie ex:birthdate "2022-08-11" .

It's an xsd:string, not a xsd:date. SHACL would notice.

     Andy

On 19/11/2022 19:13, Shaw, Ryan wrote:
> Currently, riot RDFS inference outputs “generalized” RDF which may not be parsable by other tools (including various Jena CLI tools). For example:
> 
> data.ttl:
> 
> ```
> PREFIX ex: <http://example.org/>
> 
> ex:louie ex:birthdate "2022-08-11" .
> ```
> 
> vocab.ttl:
> 
> ```
> PREFIX ex: <http://example.org/>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> 
> ex:birthdate rdfs:range xsd:date .
> 
> ```
> 
> Output of riot --rdfs=vocab.ttl data.ttl:
> 
> ```
> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> 
> "2022-08-11" rdf:type xsd:date .
> ```
> 
> … which is generalized RDF due to the literal in the subject position.
> 
> It would be nice if there were a flag to filter out such triples, so as to avoid errors when subsequently processing the output with tools that don't accept generalized RDF.
> 
>