As described in Section A.1.3, some quantity codes may be defined locally. These codes all begin with 77 as the first two hex digits. The specification of the last six hex digits is left to each site to specify. This allows sites to define special quantities that will not fit in any other categories. Also, these codes will not have to be registered through the central site, allowing for flexibility on the part of each site.
If a locally defined code proves to be widely used, a request should be made to Site 1 for its addition to the list of centrally defined quantity codes.