When building services within a Service Oriented Infrastructure (SOI) you typically do so by composition of other services. Those other services are typically discovered dynamically either by browsing the registry or by broadcasting to the entire SOI. The information returned by such a search (registry or broadcast) contains service contract information (such as the SLA, type of service, work it offers etc.) and the developer can then select the right service(s) from the list. Newly created services (either composites or atomic) are then published back to the registry (or the SOI).