Systems, methods, and apparatus, including computer program products, providing unique identifiers for data-bearing digital objects. Inner wall coordinates of the actual hole are obtained from the center coordinate of the actual hole. The longitudinal stiffness of the at least one internal belt may be at least twice the external belt’s longitudinal stiffness. to deposit a compound such as a III-V semiconductor. The aforementioned converters andor methods include, but are not limited to, features for supporting framework differences in object hierarchy, exceptions, type characteristics, reflection transparency, andor scoping.