Version

5.3.0

What happened?

Issue Description

When the sh:uniqueLang constraint is violated, the validation report does not include the duplicated value node. This makes it difficult to identify which specific values caused the violation.

Expected Behavior

The validation report should provide the duplicated value node, allowing users to pinpoint the exact issue in their data.

Steps to Reproduce

1. Define a SHACL shape with sh:uniqueLang true.
2. Validate data that contains multiple values with the same language tag for a property.
3. Observe the validation report.

Actual Behavior

• The validation report states that the constraint was violated but does not indicate the specific duplicated value node.

Expected Behavior

• The validation report should include the exact value nodes that caused the violation.

Example

SHACL Shape

ex:BuildingShape a sh:NodeShape ;
    sh:targetClass ex:Building ;
    sh:property [
        sh:path ex:label ;
        sh:datatype rdf:langString ;
        sh:uniqueLang true ;
        sh:message "Each building label should have only one value per language." ;
    ] .

Invalid Data

ex:Building1 a ex:Building ;
    ex:label "Building"@en , "Edifice"@en , "Gebäude"@de .

Relevant output and stacktrace

Are you interested in making a pull request?

Yes