pub unsafe static kMDItemAppleLoopsRootKey: Option<&'static CFString>MDItem only.Expand description
Meta data attribute that stores the root note or tonic for the loop, and does not include the scale type. The root key is represented as follows: “C” “C#/Db” “D” “D#/Eb” “E” “F” “F#/Gb” “G” “G#/Ab” “A” “A#/Bb” “B” “NoKey”
Meta data attribute that stores key filtering information about a loop. Loops are matched against projects that often in a major or minor key. To assist users in identifying loops that will “fit” with their compositions, loops can be tagged with one of the following key filters: “AnyKey” “Minor” “Major” “NeitherKey” “BothKeys”. AnyKey means that it fits with anything (whether in a major key, minor key or neither). Minor fits with compositions in a minor key. NeitherKey doesn’t work well with compositions that are in major or minor key. BothKeys means it fits with major or minor key.
Meta data attribute that stores how a file should be played. Tagged files can either be loops or non-loops (e.g., a cymbal crash). “Looping” indicates if the file should be treated as a loop. “Non-looping” indicates the file should not be treated as a loop.
Meta data attribute that stores multiple pieces of descriptive information about a loop. Besides genre and instrument, files can contain descriptive information that help users in refining searches. A file can have multiple descriptors associated with them, though they come in pairs of antonyms (e.g., “Acoustic” and “Electric”). A file can have zero or more descriptors.
Meta data attribute that stores the category of instrument. Files should have an instrument associated with them (“Other Instrument” is provided as a catch-all). For some categories, like “Keyboards” there are instrument names which provide a more detailed instrument definition (e.g., Piano, Organ, etc.)
Meta data attribute that stores the name of instrument (relative to the instrument category) Files can have an instrument name associated with them if they have certain instrument categories (e.g., the category Percussion has multiple instruments, including Conga and Bongo).
If this item is a bundle, then this is the CFBundleIdentifier
See also Apple’s documentation