SHACL Inference Rules - Use Case: consistent language tag handling for SKOS labels

[robert-david]

SKOS concepts use labels as a textual representation. These labels can be used for concept annotations in documents, where they are textually matched to terms in the text. In this use case, it is important to have a clear definition of languages and every label should define the language as a tag so that it is only matched in documents of the same language. If a label has no tag, it can be added (inferred) based on a default language, which can be defined for a specific use case.

Data graph:

@prefix ex: <http://example.com/ns#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

ex:concept1 a skos:Concept ;
    skos:prefLabel "animals" ;
    skos:altLabel "fauna"@en .

Shapes graph:

@prefix ex: <http://example.com/ns#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

ex:ConceptShape a sh:NodeShape ;
    sh:targetClass skos:Concept ;
    sh:property [
        sh:path skos:prefLabel ;
        sh:languageIn ( "en" ) ;
    ] .

[ajnelson-nist]

@robert-david - Thank you for sending this. Would you mind using triple-backticks to syntax-highlight your Turtle? E.g., substituting characters:

'''turtle
ex:A
a rdfs:Class .
'''

[afs]

This is doubly important because @Prefix is a real github id; @base is a github org.

Please use PREFIX - it's safer.

[tpluscode]

I just added wrapped the turtle in code blocks

[VladimirAlexiev]

hi @robert-david in this case do you want to check the lang en or infer the lang en?

A related checking case: EuroVoc is uniformly translated in something like 25 languages.
Thus each concept should have prefLabel in all these languages.
This is unlike most other thesauri (eg Getty AAT) that have only occasional translations.

[TallTed]

Tangential: @ajnelson-nist — Re: #298 (comment), note that you can codefence with triple-tilde (~~~) when the code you want to fence itself includes triple-backtick-fenced blocks, a la —

```turtle
ex:A
a rdfs:Class .
```

[ajnelson-nist]

Oh neat! Thank you, @TallTed !