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+--- Module for accessing and updating data about the user's library of tracks.
+-- @module database
+
+local database = {}
+
+--- Returns a list of all indexes in the database.
+-- @treturn Array(Index)
+function database.indexes() end
+
+--- An iterator is a userdata type that behaves like an ordinary Lua iterator.
+-- @type Iterator
+local Iterator = {}
+
+--- A TrackId is a unique identifier, representing a playable track in the
+--- user's library.
+-- @type TrackId
+local TrackId = {}
+
+--- A record is an item within an Index, representing some value at a specific
+--- depth.
+-- @type Record
+local Record = {}
+
+--- Gets the human-readable text representing this record. The `__tostring`
+--- metatable function is an alias of this function.
+-- @treturn string
+function Record:title() end
+
+--- Returns the value that this record represents. This may be either a track
+--- id, for records which uniquely identify a track, or it may be a new
+--- Iterator representing the next level of depth for the current index.
+---
+--- For example, each Record in the "All Albums" index corresponds to an entire
+--- album of tracks; the 'contents' of such a Record is an iterator returning
+--- each track in the album represented by the Record. The contents of each of
+--- the returned 'track' Records would be a full Track, as there is no further
+--- disambiguation needed.
+-- @treturn TrackId|Iterator(Record)
+function Record:contents() end
+
+--- An index is heirarchical, sorted, view of the tracks within the database.
+--- For example, the 'All Albums' index contains, first, a sorted list of every
+--- album name in the library. Then, at the second level of the index, a sorted
+--- list of every track within each album.
+-- @type Index
+local Index = {}
+
+--- Gets the human-readable name of this index. This is typically something
+--- like "All Albums", or "Albums by Artist". The `__tostring` metatable
+--- function is an alias of this function.
+-- @treturn string
+function Index:name() end
+
+--- Returns a new iterator that can be used to access every record within the
+--- first level of this index.
+-- @treturn Iterator(Record)
+function Index:iter() end
+
+return database