ViatraQueryEngine: the central element of the API.
QueryScope: the set of model elements the ViatraQueryEngine should work on.
The project itself implements only EMFScope right now.
IQueryRuntimeContext: wrapper class for the query backends to access the model. The access can be both indexed and non-indexed.
IQueryBackend: an executor of graph pattern matches; it instantiates IQueryResultProviders. Query Backends needs to be registered to the ViatraQueryEngine itself.
RetePatternMatcher is the fully incremental implementation of the IQueryResultProvider interface.
LocalSearchResultProvider is a local search based implementation of the IQueryResultProvider interface.
The ViatraQueryMatcher interface is the public matcher API: generated instances are type-safe.