//! Provides everything needed for building and querying indices.
//! Structs that implement the `Index` trait are made public here.
//! Currently only `BooleanIndex` falls in that category.
//! there are different implementations of storing them (e.g. on disk, in ram).
//! These storage implementations can be found in `storage`.
//! Please refer to [`IndexBuilder`](boolean_index/struct.IndexBuilder.html) for usage details.
/// yet they all share this very basic interface.