Abstract: A computer-implemented method for listing available resources in a client-server e-commerce system. The method comprises receiving from a first seller a first listing of at least one resource offered by the first seller and receiving from a second seller a second listing of at least one resource offered by the second seller. For each resource of the first and second listings, the method further comprises receiving an indication of attributes of the resource, receiving an indication of relationships between the attributes, and based on the received indication of attributes and the indication of relationships, dividing the attributes into at least two sets, wherein the dividing of the attributes is characteristic of an organizational structure offering services.