Based on the DATEX II Platform Independent Model for data exchange (Exchange PIM), this document specifies the Exchange Platform Specific Model (Exchange PSM) for Web Services over http.
The term "Web Services" is used generically here, since profiles for the Web Services protocol stack (WSDL & SOAP) as well as plain HTTP exchange options are provided.
2 files describe the WSDL services, one for the Pull operating mode, the other for the Push operating modes.
You can download the 3 files together in a zip file from the link below.