Inconsistencies, errors, ... in SHACL shapes

[chrdebru]

• [ ] Misleading descriptions in https://github.com/chrdebru/rml-core/blob/main/shapes/subject_map.ttl

    sh:message """
    Subject Map must generate an IRI representing the subject of an RDF triple.
    """

should be

    sh:message """
    Subject Map must generate a resource representing the subject of an RDF triple.
    """