| isValid | 
        Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference. | 
      
      
        | linearEntityOne | 
        Gets the first linear edge, construction line, or sketch line that defines the construction plane. | 
      
      
        | linearEntityTwo | 
        Gets the second linear edge, construction line, or sketch line that defines the construction plane. | 
      
      
        | objectType | 
        This property is supported by all objects in the API and returns a string that contains the full name (namespace::objecttype) describing the type of the object.
   It's often useful to use this in combination with the classType method to see if an object is a certain type. For example: if obj.objectType == adsk.core.Point3D.classType(): | 
      
      
        | parentConstructionPlane | 
        Returns the ConstructionPlane object |