Under Quebec law, an agreement in principle (or agreement in principle) is not one of the treaties named under the Civil Code of Quebec. It is therefore generally governed by the complementary and mandatory rules of the Civil Code and their interpretation by the jurisprudence of the courts. According to the Duhaime Dictionary, an agreement in principle is an oxymoron in the common law, which is merely an expression of the intent of the parties who have no legal value in themselves, because in order to form a contract, there must be nothing left to negotiate.  The agreement in principle is an agreement whereby two or more parties only set out certain elements of a future contract. In particular, agreements in principle for labour law are found in negotiations between employers and trade unions and in public law, such as an agreement in principle between the state and an indigenous community.  According to French law, the agreement in principle itself has the nature of a contract if it contains the essential elements of the treaty prescribed by the Civil Code (lawful and particular content, capacity, consent). Section 1785 C .c.Q. provides that the sale of a building must be preceded by a preliminary contract in which a person promises to purchase the building. Art. 1786 C.c.Q. indicates what should be included in this preliminary real estate contract.