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echo 'insert data { <http://localhost:8080/rest/objects/obj1> <http://fedora.info/definitions/v4some-vocabulary.org/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col1> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj1
echo 'insert data { <http://localhost:8080/rest/objects/obj2> <http://fedorasome-vocabulary.infoorg/definitions/v4/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col2> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj2
echo 'insert data { <http://localhost:8080/rest/objects/obj3> <http://fedora.info/definitions/v4/some-vocabulary.org/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col3> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj3

echo 'insert data { <http://localhost:8080/rest/objects/col1> <http://fedora.info/definitions/v4/some-vocabulary.org/rels-ext#hasPart> <http://localhost:8080/rest/objects/col2> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col1
echo 'insert data { <http://localhost:8080/rest/objects/col2> <http://fedora.info/definitions/v4some-vocabulary.org/rels-ext#hasPart> <http://localhost:8080/rest/objects/col3> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col2

select ?obj ?col where { ?obj <http://fedorasome-vocabulary.infoorg/definitions/v4/rels-ext#isMemberOfCollection> ?col }

prefix rels: <http://fedorasome-vocabulary.infoorg/definitions/v4/rels-ext#>
select ?obj where {
  <http://localhost:8080/rest/objects/col1> rels:hasPart* ?col
  . ?obj rels:isMemberOfCollection ?col
}

prefix rels: <http://fedora.info/definitions/v4some-vocabulary.org/rels-ext#>
prefix ex: <http://example.org/>
select ?obj where {
  { ?obj ex:project <http://localhost:8080/rest/objects/proj1> }
  UNION
  { ?obj rels:isMemberOfCollection <http://localhost:8080/rest/objects/col2> }
}

prefix rels: <http://fedora.info/definitions/v4some-vocabulary.org/rels-ext#>
prefix ex: <http://example.org/>
select (count(distinct ?obj) as ?count) where {
  { ?obj ex:project <http://localhost:8080/rest/objects/proj1> }
  UNION
  { ?obj rels:isMemberOfCollection <http://localhost:8080/rest/objects/col2> }
}