Hi Michel,

First we should make sure that the users of your models understand the 
distinction between namespaces and graph URIs. You can of course use the same 
namespace (e.g., https://w3id.org/def/nen2660# <https://w3id.org/def/nen2660#>) 
in multiple graphs. What you are probably referring to is the Graph URI under 
which the models will be downloaded from on the Web.

For the RDFS part, assuming this merely declares classes, properties and their 
relationships, I suggest they should be found at the URI that is like the 
namespace (except maybe without the #). Then, the OWL version could be at a URI 
ending with nen2660-owl and the SHACL version could be at nen2660-shacl, and 
both would have owl:imports statements to the RDFS Graph URI. OWL is typically 
pretty strict about what is allowed in the models, e.g. to preserve the OWL DL 
logic. On the other hand, SHACL is quite relaxed if a graph also contains OWL 
axioms - they will simply be ignored. So in theory the SHACL graph may 
owl:import the OWL version too.

Using owl:imports will make sure that declarations are not repeated across 
files, and therefore don’t risk running out of sync, e.g. if someone changes 
the RDFS classes only in one file.

I don’t know enough about how the SKOS version is different to comment on that. 
I would find it rather confusing if a resource is a class in one graph but a 
SKOS concept in another.

The topic of RDF/XML vs Turtle etc is another dimension, typically solved using 
HTTP content negotiation. All serialisations would be accessible from the same 
server URLs yet the server would return different results depending on what 
accept header the client requests.

Holger


> On 6 Apr 2021, at 6:20 pm, 'Bohms, H.M. (Michel)' via TopBraid Suite Users 
> <topbraid-users@googlegroups.com> wrote:
> 
> In case I have the same specification on different modelling levels:
> Skos
> Rdfs
> Rdfs+owl
> Rdfs+shacl
>  
> Is there some best practice  for the name space?
>  
> (compare same name space for different serializations but now for different 
> languages used…).
>  
> I now have ie:
>  
> # baseURI: https://w3id.org/def/nen2660-rdfs 
> <https://w3id.org/def/nen2660-rdfs>
>  
> But I got the comment that just:
> # baseURI: https://w3id.org/def/nen2660 <https://w3id.org/def/nen2660>
>  
> was preferred.
>  
> But then I have 4 variants (actually 12: all in rdf/xml, turtle and json-ld) 
> specifying for the same name space.
>  
> Thx for advice,
> Michel
>  
>  
>  
> Dr. ir. H.M. (Michel) Bohms
> Scientist Specialist
> Structural Reliability
> T +31 (0)88 866 31 07
> M +31 (0)63 038 12 20
> E michel.bo...@tno.nl <mailto:michel.bo...@tno.nl>    
> Location <http://www.tno.nl/locations/DTS>
> 
>  
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