Administrative Procedure Act Article 135
Legal relations under public law may be created, altered or extinguished by contracts, except where no contract may be made by the nature of the relations or under law or regulation.
中文原文 行政程序法第135條
公法上法律關係得以契約設定、變更或消滅之。
但依其性質或法規規定不得締約者，不在此限。
但依其性質或法規規定不得締約者，不在此限。