Exhibit 5.2 Types of B2E EC Buvers Sellers Company A Company A ompany B Company B Company C Company C Company D Company D (a)Sell-Side B2B (b)Buy-Side B2B Services Others Governmet Sellers ers Hub Sellers Community An exchange Industry Universities associations (c)Electronic Exchange (d)collaborative Commerce Electronic Commerce Prentice Hall 2006Electronic Commerce Prentice Hall © 2006 6 Exhibit 5.2 Types of B2E EC