PREFIX sdtm: <http://www.w3.org/2008/04/DiabeticPatientsDataSet/ClinicalPracticeOntology-Version3.owl#sdtm_>
SELECT ?somePerson
#  FROM <data.ttl>
 WHERE {
{?someTest sdtm:fool ?somePerson } UNION {
_:someTestBNode sdtm:subject ?somePerson .
}
}