| http://www.w3.org/ns/prov#value | - The importance of maintenance arises from the fact that it: 1 - covers most of the lifetime of the project when compared with other phases of the project such as design and implementation, continuing for 20 to 100 years for some structures where design and implementation may not exceed four years for medium projects. 2 - saves costs, since suitable expenditure on maintenance results in saving the
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