a media item property that can be used as a predicate
- persistent id : an id for the item
- album persistent id : an id for the album
- artist persistent id : an id for the artist
- album artist persistent id : an id for the album artist
- album genre persistent id : an id for the genre
- album composer persistent id : an id for the composer
- album podcast persistent id : an id for the podcast
- media types : media types in a list with one per line of:
* music
* podcast
* audio book
* audio iTunesU
* any audio
* movie
* tv show
* video podcast
* music video
* video iTunesU
* any video
* any
- title
- album title
- artist
- album artist
- genre
- album composer
- is compilation : true if the item is a compilation
- is in cloud : true if the item is in the cloud rather than on the
device
- podcast title
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