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
<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
> On 28 Jul 2022, at 10:04 am, Fan Li <[email protected]> wrote:
>
> 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?
>
> On Thursday, July 28, 2022 at 8:54:37 AM UTC-4 [email protected] wrote:
> 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 <[email protected]
>> <applewebdata://C1DF41A9-26B1-4A2F-AF48-81436EEBABA2>> 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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