The present document is part 1 of the Stage 3 Parlay X Web Services specification for Open Service Access (OSA). The OSA specifications define an architecture that enables application developers to make use of network functionality through an open standardized interface@ i.e. the OSA APIs The present document specifies the Common aspects of the Parlay X Web Services. The following are defined here: ? Name spaces. ? Data definitions. ? Fault definitions. ? WSDL Description of the interfaces.