The trading community, in other words chambers of commerce and amongst them the International Chamber of Commerce in Paris for many years now have been establishing what is being called trade practice, the lex mercatoria, but there is more and more of a tendency to try to provide written texts for it.
La communauté des marchands, c'est-à-dire les chambres de commerce, et parmi elles la Chambre de commerce international de Paris, ont élaboré depuis de nombreuses années ce que l'on appelle des usages commerciaux, la lex mercatoria, mais que l'on tend de plus en plus à vouloir cristalliser dans des textes.