Incorrect use of rdfs:domain about icas-ontology HOT 2 OPEN

I fully support @IllidanS4 's review comment. Regarding solution, although S4 's suggestion is certainly valid, I suggest the use of a blank node to improve terseness and readability, as follows:

:lastAccessedOn
    a owl:DatatypeProperty, owl:FunctionalProperty ;
    rdfs:domain [
    	owl:unionOf (
            :Directory :File
        )
    ] ;
    rdfs:range xsd:dateTimeStamp .

from icas-ontology.

Apart from the above, is it really the intention to apply rdfs:domain and rdfs:range in the way that it is specified? Its application is often confused as setting a data restriction, as opposed to its actual function that is to infer something to be of a certain class. In this example, with the following data:

<A> :lastAccessedOn <B> .

the function of the rdfs:range statement would be to infer that

<B>  rdf:type xsd:dateTimeStamp .

I assume, though, that the authors expected an error message of some sort in case <B> did not actually denote an xsd:dateTimeStamp. However, in order to enforce this behaviour one would apply a SHACL statement to specify that particular data constraint.

from icas-ontology.