Find some RDF datasets in DataCite:
$ curl 'https://api.datacite.org/dois?query=formats:application%2Frdf%2Bxml' \
| jq '{"id":.data[].id, "formats":.data[].attributes.formats}'
{
"id": "10.18434/t4/1435037",
"formats": [
"application/rdf+xml",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"