How would a query look for all data Bob can read including public data?

[tfrancart]

TODO This does not include public data. How would a query look for all data Bob can read including public data?

PREFIX acl: <http://www.w3.org/ns/auth/acl#>
PREFIX as: <https://www.w3.org/ns/activitystreams#>

SELECT ?s ?p ?o WHERE {
    BIND( <<?s ?p ?o>> AS ?t ) .
    {
      { <http://example.com/bob/authorization/read> acl:accessTo ?t . } UNION { as:Public acl:accessTo ?t . }
    }
}