D: Web Services Architecture
Web Service
-  Instance of Service Oriented Architecture 
 
-  Software system designed to support interoperable networked machine-to-machine interaction 
 
-  Interface described in a machine-processable format (WSDL) 
 
-  Interaction through SOAP messages 
 
-  Conveyed using HTTP with an XML serialization 
 
Web Services Architecture 
-  Standard means of interoperating between different software applications
 
-  Applications can run on a variety of platforms and/or frameworks
 
-  Interoperability through the definition of compatible protocols 
 
Roles of Humans and Machines