Country -> Region Inference in EDG

[Fan Li]

Sorry if this is a trivial question. I am picking up SHACL inference in EDG again. We'd like users to select a country (e.g. United States) and automatically infer the region it belongs to (e.g. North America). How to accomplish this in EDG? Thanks!

[Holger Knublauch]

Hi Fan Li,

What would be the formula (in prose) to infer the region from a country? If that info is already stored as a triple such as ex:USA ex:region ex:NorthAmerica then you wouldn’t need an inference. But without such triples, where would the sh:values rule look up that knowledge?

Holger

On 28 Jul 2022, at 7:29 am, Fan Li <lifa...@gmail.com> wrote:

Sorry if this is a trivial question. I am picking up SHACL inference in EDG again. We'd like users to select a country (e.g. United States) and automatically infer the region it belongs to (e.g. North America). How to accomplish this in EDG? Thanks!

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[Fan Li]

Hi Holger, thanks for your reply. In this case, the two attributes may be linked by an existing triple (ex:USA ex:region ex:NorthAmerica). In other cases, they may be linked by some SHACL property value rule or custom SPARQL query.

My question is when a user enters value in one attribute, how can we automatically populate the other attribute in the user interface? Do I just need to set "sh:values" for the 2nd attribute? Could you please provide an example?

[Holger Knublauch]

Ok, let’s assume the simple case for now, where we have ex:USA ex:region ex:NorthAmerica. Then let’s assume we have an ex:Address class with properties ex:country and ex:inferredRegion. Once the user selects USA and saves changes, the inferred value should show up:

ex:Address

    a owl:Class, sh:NodeShape ;

    sh:property ex:Address-country ;

    sh:property ex:Address-inferredRegion ;

…

ex:Address-inferredRegion

    a sh:PropertyShape ;

    sh:path ex:inferredRegion ;

    sh:values [

        sh:path ( ex:country ex:region ) ;

    ] .

The design above uses a path expression (SHACL node expression) that gets the asserted region of the asserted country. The complete syntax of such node expressions is defined in https://w3c.github.io/shacl/shacl-af/#node-expressions

If you need something more complex, you can define sh:values rules using JavaScript/ADS or SPARQL. When you enter sh:values rules on the form, the system actually suggests to use JavaScript. To enter SPARQL, the syntax would be like

sh:values [

    sh:select “””

        PREFIX ex: ...

        SELECT ?region

        WHERE {

            $this ex:country / ex:region ?region .

        } “”” ;

]

HTH

Holger

 

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