Incorrect Data Type for sh:namespace in SHACL Declaration

[Zakaria29041996]

Description:

In the SHACL (Shapes Constraint Language) RDF ontology, the sh:declare statement currently specifies the sh:namespace as a plain string:

sh:declare [
    sh:prefix "sh" ;
    sh:namespace "http://www.w3.org/ns/shacl#" ;
] ;

This can lead to issues with certain reasoners, especially when the SHACL ontology is indirectly imported. Some reasoners expect the sh:namespace to be explicitly typed as xsd:anyURI for correct interpretation.

Proposed Change:

To ensure compatibility with reasoners and avoid errors, the sh:namespace should be explicitly typed as xsd:anyURI:

sh:declare [
    sh:prefix "sh" ;
    sh:namespace "http://www.w3.org/ns/shacl#"^^xsd:anyURI ;
] ;

This change will help resolve the issues encountered with reasoners that rely on type checking for URI values.