Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference.
"twoDistancesChamferTypeDefinition_var" is a variable referencing a TwoDistancesChamferTypeDefinition object. | 
        
"twoDistancesChamferTypeDefinition_var" is a variable referencing a TwoDistancesChamferTypeDefinition object. |