When the mediation primitive gets the request, it queries for all ports matching the port type identified in the properties.
在中介元素得到请求时，它将查询与属性中定义的端口类型匹配的所有端口。
2
In the mediation flow shown in Figure 15, any request processing must occur before Router custom mediation primitive, and any response processing must occur before the InputResponse node.
This value is important, as it will enable us to build an http request, allowing the XSLTransform primitive in the mediation flow to load it dynamically.