A method forms a collaborative product taxonomy instantiation by starting with or defining a base taxonomy instantiation and collaborating between trading parties to negotiate a collaborative product taxonomy instantiation. The taxonomy instantiation comprises a set of characteristics and values of a desired product. The method assigns a set of characters to the collaborative product taxonomy instantiation. The method uses the set of alphanumeric characters in an electronic trade exchange between a buyer software application and a seller software application. The seller software application may determine whether it has a product that is equivalent to the collaborative product taxonomy instantiation.