-- File:	STEPSelections_SelectInstances.cdl
-- Created:	Tue Mar 23 15:10:13 1999
-- Author:	data exchange team
--		<det@friendox.nnov.matra-dtv.fr>
---Copyright:	 Matra Datavision 1999


class SelectInstances from STEPSelections inherits SelectExplore from IFSelect

	---Purpose: 

uses
    
    AsciiString from TCollection,
    EntityIterator,
    Graph
is
    
    Create returns mutable SelectInstances;

    RootResult(me; G : Graph) returns EntityIterator;

    Explore (me; level : Integer; ent : Transient; G : Graph;
    	     explored : in out EntityIterator)
    returns Boolean;
    
    ExploreLabel (me) returns AsciiString from TCollection;
    ---Purpose : Returns a text defining the criterium : "Instances"
    
    HasUniqueResult (me) returns Boolean is redefined protected;

end SelectInstances;