DELETE {
  <http://acme.test/wiki/Special:CategoryDump> schema:dateModified ?o .
}
WHERE {
  <http://acme.test/wiki/Special:CategoryDump> schema:dateModified ?o .
};
INSERT DATA {
  <http://acme.test/wiki/Special:CategoryDump> schema:dateModified "2017-08-25T00:29:09Z"^^xsd:dateTime .
}