Here we study the architecture and characteristics of the broker network. We are using a particular internal structure for the events (defined in XML but currently implemented as a Java object). We assume a sophisticated matching of publishers and subscribers defined as general topic objects (defined by an XML Schema that we have designed). However these are not the central issues to be discussed here. Our study should be useful whether events are defined and transported in Java/RMI or XML/SOAP or other mechanisms; it does not depend on the details of matching publishers and subscribers. Rather, we are interested in the capabilities needed in any implementation a.
