11-rdf:
* tracker:added:
  - Used for recently added playlist.

30-nie:
* nie:url:
  - For looking up the URN or other properties of a file where we already know
  the URL/path. Used by tracker-miner-fs, for example.

31-nao:
* nao:hasTag:
  - For use cases where fts:match needs to be done against tags in addition to
  the class itself

32-nco:
* nco:hasIMAccount:
  - For use cases where fts:match needs to be done against the account in
  addition to the class itself

* nco:hasEmailAddress:
  - For use cases where fts:match needs to be done against the email account
  in addition to the class itself

* nco:hasPostalAddress:
  - For use cases where fts:match needs to be done against the postal address
  in addition to the class itself

* nco:nameFamily:
  - Used for listing contacts sorted by last name

33-nfo:
* nfo:fileLastModified:
  - The miner-fs uses this property during crawling a lot

* nie:contentCreated domainIndex for nfo:Visual
  - Used to improve performance of ORDER BY on nie:contentCreated

38-nmm:
* nmm:musicAlbum:
  - Used for retrieving songs on an album.
  - Used in cases where fts:match is done against the album as well as the song

* nmm:performer:
  - Used for retrieving songs by a performer.
  - Used in cases where fts:match is done against the performer as well as the song.

* nmm:artistName:
  - Used to improve performance of ORDER BY for music team queries

* nie:title domainIndex for nmm:MusicAlbum
  - Used to improve performance of ORDER BY on nie:title

* nie:title domainIndex for nmm:MusicPiece
  - Used to improve performance of ORDER BY on nie:title
