Web Services features list (1/2)
    
    
      - Asynchrony: callback/polling mechanisms;
 
      
      - Routing: forward and reverse message
	paths;
 
      
      - Reliability;
 
      
      - Caching;
 
      
      - Security: digital signatures, encryption,
	credentials, and authentications;
 
      
      - Semantic of messages;
 
      
      - Packaging: containers for SOAP messages, like MIME or
	DIME;