The first step to start designing BPEL services is to document the business process using an easy-to-read visual notation. Services interaction occurs through a standard WSDL format. WSDL is also used to represent the interfaces exposed by the service to the systems outside:
SOA is an IT strategy that organizes discrete functions services from enterprise applications. SOA enables an enterprise to quickly deliver for business requirements by combining and reusing existing discrete functions services.
Usually, a typical SOA environment consists of several applications with multiple interdependencies. The high level flow of a typical service-based application can be given as follows: