++++ 1 . Approximation of legislation - Procedures for the award of public works contracts - Directive 71/305 - Scope - Exclusion of water and energy services - Publication in the Official Journal of a notice relating to a contract covered by the exception - Effect - Applicability of the directive - None ( Council Directive 71/305, Art . 3 ( 5 ) ) 2 . Free movement of goods - Quantitative restrictions - Measures having equivalent effect - Public works contract - Invitation to tender - Technical specification requiring the materials used to comply with a national standard - Not permissible ( EEC Treaty, Art . 30 )