Finding the links where you can pay to download an Album or a Track

From Music Ontology Wiki

 1        PREFIX mo: <http://purl.org/ontology/mo/>
 2        SELECT ?download_link_album ?download_link_track
 3        WHERE 
 4        {
 5            { 
 6                <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> a mo:Record.
 7                { 
 8                    <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> mo:mailorder ?download_link_album
 9                }
 10               UNION
 11               { 
 12                   <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> mo:paiddownload ?download_link_album
 13               }
 14           }
 15           UNION
 16           {
 17               <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> mo:has_track ?track.
 18               ?track a mo:Track.
 19               { 
 20                   ?track mo:mailorder ?download_link_track
 21               }
 22               UNION
 23               {
 24                   ?track mo:paiddownload ?download_link_track
 25               }
 26           }
 27    }