Many corporations also adopt additional governing rules known as bylaws. Each organization has its basic rules contained in its bylaws. Particular villages retain autonomy under the Hopi Constitution and Bylaws. This group created rules regarding eligibility, bylaws, and elected leaders for this association. Its bylaws prohibit dealing with intellectual property issues. Real clarity exists only at the level of administrative rules, circulars or bylaws. The Eclipse Foundation is governed by a set of bylaws, agreements, and policies. Bylaws and local municipal codes often regulate rainwater harvesting. The decision to change the bylaws was passed by the board unanimously. The first metric involves a violation of the organization's bylaws or written ethical policies. Officers execute their duties in accordance with The Mersey Tunnels Bylaws. There are very few records of magistrates enforcing the bylaws. Various space, dwelling placement bylaws and local building codes may also be extensively violated. The group's local chapters are structured hierarchically according to its National Bylaws. There were also doubts as to whether the 1842 bylaws were legal.