Re: polymorphic RDF mapping

Dear Fano,

Being part of the KG Construct Community Group 
<https://www.w3.org/community/kg-construct/>, I can tell you that RML 
<https://w3id.org/rml/portal/> is flexible enough to support your use case.
Depending on the structure of the source data, you could use 
conditionals (ongoing specification work 
<https://github.com/kg-construct/rml-fnml/pull/46>) to say 'if type is 
X, then generate following predicates and objects', but in this case, 
given your polymorphism is quite straightforwardly represented based on 
the 'type' value, you could just use JSONPath to filter all objects of 
type 'person' to be mapped using mappings X, and all objects of type 
'parcel' to be mapped using mappings Y.

See eg https://jsonpath.com/: using JSONPath expression 
$.phoneNumbers[?(@.type=="home")].number , you only get phone numbers of 
type 'home', similarly you could use JSONPath expression 
$[?(@.type=='person')] to filter objects of type person.

To see this in action, you can try at https://rml.io/yarrrml/matey/: if 
you load the 'People (JSON)' example and click 'Generate LD', you see 
triples generated for all three people, if you replace line 7 of the 
Input:YARRRML screen with `      - ['data.json~jsonpath', 
"$.persons[?(@.firstname=='John')]"]
`, it will only use those mappings to generate triples for input objects 
with condition 'firstname is John'.
You could image to add another mapping that generates very different 
triples for input objects with condition 'firstname is Jane'.

Feel free to get back to me for follow-up!

Kind regards,
Ben
Ben De Meester
Researcher Semantic Web
imec - Ghent University - IDLab | Faculty of Engineering and 
Architecture | Department of Electronics and Information Systems
Technologiepark-Zwijnaarde 122, 9052 Ghent, Belgium
t: +32 9 331 49 56 | e: ben.demeester@ugent.be | URL: 
https://ben.de-meester.org/#me


On 27/09/2024 10:57, fano.ramparany@orange.com wrote:
>
> Hi,
>
> Are there any polymorphic RDF mapping tool?
>
> More concretely , we use a json data source which publish heterogenous 
> json documents such as in the following example:
>
> [
>
>     {
>
>         "type" : "person",
>
>         "name" : "peter",
>
>         "age" : 30
>
>     },
>
>     {
>
>         "type" : "parcel",
>
>         "id" : "p320",
>
>         "weight" : 2,
>
>         "recipient" : {
>
>              "name" : "daniel",
>
>     "address" : "2, Harbor Str., Hopville"
>
>         }­­­
>
>     }
>
> ]
>
> Thank you in advance for your help
>
> Orange Restricted
>
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