Data & Machines, Service Based (cont.)

In Web Services, all major blocks are described in XML
W3C concentrates on some of the basics of WS:
- protocol to transfer data over the Internet (SOAP)
  - the document to transfer is itself in XML, too
  - transfer may rely on HTTP, but not necessarily
- description of the service interfaces (WSDL)
- global view on cooperating services (WS-CDL)
  - referred to as “choreography”
  - based on π-calculus
- other areas are under discussion
Other building blocks are done elsewhere
- these are usually on a higher level