https://groups.google.com/forum/#!topic/islandora/e-ZUkRUFC-4
select ?s from <#ri> where {
?s <fedora-rels-ext:isMemberOfCollection> <info:fedora/islandora:bookCollection>
}
select ?object from <#ri> where {
?object <http://islandora.ca/ontology/relsext#isPageOf> <info:fedora/islandora:18>
}