# Package org.eclipse.emf.facet.efacet.core

Interface Summary
IDerivedTypedElementManager: Used to evaluate derived typed elements through their queries.
IFacetActions: This interface contains methods to create `FacetSet`s.
IFacetCommandFactory: This interface provide a command factory.
IFacetCommandFactoryFactory
IFacetManager: This interface allows clients to use the EMF Facet API to get and set the values of virtually added `EReference`s and `EAttribute`s, and invoke `EOperation`s.
IFacetManagerFactory: Factory for `IFacetManager`.
IFacetManagerListener: This interface allows clients to manage listeners added on the `IFacetManager`
IFacetManagerProvider
IFacetSetCatalogManager
IFacetSetCatalogManagerFactory

Class Summary
FacetUtils