| http://www.w3.org/ns/prov#value | - If a song changes position on your music player, its track number on the music player might change, however the song itself is still the same - A song on your ipod does not care where it exists in relation to other songs on your playlist, but if 'track' was an attribute of a song, your song would behave differently every time you moved it to a different position in the playlist.
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