# Package org.eclipse.incquery.runtime.matchers.backend

- Interface Summary
  Interface | Description
  --- | ---
  IQueryBackend | Internal interface for an IncQuery query specification.
  IQueryBackendFactory | Factory for instantiating `IQueryBackend`.
  IQueryBackendHintProvider | Provides query evaluation hints to evaluation backends.
  IQueryResultProvider | An internal interface of the query backend that provides results of a given query.
  IUpdateable | Internal interface for the query backend to singal an update to a query result.

- Class Summary
  Class | Description
  --- | ---
  QueryEvaluationHint | Provides IncQuery with additional hints on how a query should be evaluated.