Web access controls

The modes are classes in the ontology: www.w3.org/ns/auth/acl#Read, so a fuller definition would be:

term :Read,
    label: "Read".freeze,
    "rdfs:isDefinedBy" => %(http://www.w3.org/ns/auth/acl#).freeze,
    subClassOf: "acl:Access".freeze,
    type: "owl:Class".freeze