Platform Specific Model

Platform Specific Model

Exchange modelling framework

Web Services overview and options

Web Services provides standard means of interoperating between different software applications, running on a variety of platforms and/or frameworks.

Definition (W3C - Web Service architecture - « A Web Service is a software system designed to support interoperable machine-to-machine interaction over a network. It has an interface described in a machine-processable format (specifically WSDL). Other systems interact with the Web Service in a manner prescribed by its description using SOAP messages, typically conveyed using HTTP with an XML serialisation in conjunction with other Web-related standards. »

Web services definitions offer several options. Table 1 shows the options chosen by the PSMs described in this document.

Web Service Options Decision
Discovery Not dynamic : UDDI is not used, the Web Services are described in this DATEX II document which is the reference for development
Security The security set-up has to be decided by the Supplier, should be negotiated with the Clients, and is outside the scope of this specification
Encryption This has to be agreed between the Supplier and the Client, before starting data exchange

Table 1 Web Services options

Web Services PSM mapping of FEP+EP PIMs

Platform Specific Model (PIM) specification to implement FEP+EP PIM based on WS SOAP technology consists in mapping the abstract UML messages ( invocation methods and data types ) defined at FEP+EP PIM level as UML collaboration and sequence diagrams in ISO TS 19468 clauses to the corresponding SOAP WSDL methods and data structure.