This class represents a dimensional constraint node in the owning Assoc2dConstraintGroup. 

It is the base class for all the kind of dimensional constraints.

Autodesk.AutoCAD.DatabaseServices.ConstraintGroupNode
    Autodesk.AutoCAD.DatabaseServices.GeometricalConstraint
        Autodesk.AutoCAD.DatabaseServices.ExplicitConstraint
            Autodesk.AutoCAD.DatabaseServices.AngularConstraint
            Autodesk.AutoCAD.DatabaseServices.DistanceConstraint
            Autodesk.AutoCAD.DatabaseServices.RadiusDiameterConstraint

Public Class ExplicitConstraint
Inherits GeometricalConstraint

public class ExplicitConstraint : GeometricalConstraint;