Vector Product Format
Vector Product Format (VPF) is a military standard for vector-based digital map products produced by the U.S. Department of Defense (DOD). It has been adopted as part of the Digital Geographic Exchange Standard (DIGEST) in the form of Vector Relational Format (VRF), so VPF can be considered to be an international standard as well. References

External links
Military Standard
The Vector Product Format (Esri)
Vector Product Format (Library of Congress)

International standards
GIS vector file formats