KinoSearch::Store::InvIndex is an inverted index.
# abstract base class
An InvIndex is an abstract representation of an inverted index, KinoSearch's core data structure. The archetypal implementation of an invindex, FSInvIndex, is a single directory holding a collection of files. However, to allow alternative implementations such as RAMInvIndex, i/o and file manipulation are abstracted out rather than executed directly by KinoSearch's classes.
A "file" within an invindex might be a real file -- or it might be a ram file, or eventually a database record, etc. Similarly, $invindex->delete_file($filename) might delete a file from the file system, or a key-value pair from a hash, or something else.