Editorials Welcome! A note from the Exchanges editor i Feature Articles Dynamic Modification of XML Documents: External Application Invocation from XML, Ibrahim Cingil, Asuman Dogac, Ender Sevinc, and Ahmet Cosar 1 Heterogeneous Product Description in Electronic Commerce, Wee Keong Ng, Guanghao Yan and Ee-Peng Lim 7 Design Comparisons for Procurement Systems, Charles J. Thomas and Bart J. Wilson 14 Issues in Wireless E-Commerce, Peter Tarasewich and Merrill Warkentin 19 Conference and Workshop Reports The Trading Agent Competition Betsy Strother 24 ISSN 1551-9031