1. Information Management NTU Web Services

2. Information Management NTU What Are Web Services? Semantically encapsulate discrete functionality Loosely coupled, reusable components Programmatically accessible Distributed over the Internet

3. Information Management NTU A Web Services Technology Stack Source: The Stencil Group * WSFL has been replaced by BPEL4WS. ** An alternative is ebXML (a UN/CEFACT standard for EDI-style information exchange). ** *

4. Information Management NTU The Core Layers Common Internet Protocols (HTTP, HTTPS, SMTP, …): the basic communication framework for Web services XML: a widely accepted format for exchanging data and its corresponding semantics SOAP: an XML-based protocol for messaging and RPC-style communication between applications (in a distributed environment)

5. Information Management NTU The Higher-Level Layers WSDL: an XML-based description of how to connect to a particular Web service UDDI: a set of protocols and a public directory for registration and real-time lookup of Web services BPEL4WS: a framework for defining new business processes that utilize existing web services. * ebXML: defines core components, business processes, registry and repository, messaging services,...

6. Information Management NTU Implementation Models of Web Services Source: Sun Microsystems, Inc.

7. Information Management NTU A SOAP Use Case Source: Sun Microsystems, Inc.

8. Information Management NTU Core Structures of UDDI Source: Sun Microsystems, Inc.

9. Information Management NTU How WSDL Works Source: Sun Microsystems, Inc.

10. Information Management NTU How ebXML Works Source: Sun Microsystems, Inc.

11. Information Management NTU Web Services on.NET Source: TheServerSide.com

12. Information Management NTU Web Services on J2EE Source: TheServerSide.com

13. Information Management NTU Processing a Web Service Request Source: TheServerSide.com

14. Information Management NTU Registering/Discovering a Web Service Source: TheServerSide.com

15. Information Management NTU Messaging and RPC-Style Requests Source: TheServerSide.com

16. Information Management NTU The JAX* Suite JAXR (Java API for XML Registries): to look up the business partner's web service. JAX/RPC (Java API for XML RPC): to send RPC requests to external web services. JAXM (Java API for XML Messaging): to send SOAP/ebXML messages to external web service. JAXP (Java API for XML Parsing) and JAXB (Java API for XML Binding): to transform Java data into an XML format and to convert the received XML data back into a Java language construct, and to perform XSLT transforms to convert schemas.

17. Information Management NTU Invoking Another Web Service Source: TheServerSide.com

18. Information Management NTU Simple Object Access Protocol (SOAP) For information exchange in a distributed environment Message format based on XML Can be combined with various transport protocols Originally developed by Microsoft SOAP Version 1.2 now a working draft

19. Information Management NTU Parts of SOAP The SOAP envelope: for describing what is in a message and how to process it. The SOAP binding framework (added in Version 1.2): for exchanging SOAP envelopes between peers using an underlying transport protocol The SOAP encoding rules: for exchanging instances of application-defined data types. The SOAP RPC representation: a convention for representing remote procedure calls and responses.

20. Information Management NTU A SOAP Message 1 2001-06-22T14:00:00-05:00 Pick up Mary at school at 2pm

21. Information Management NTU Composition of a SOAP Envelope Source: http://www.w3.org/TR/soap12-part1/

22. Information Management NTU A SOAP Envelope <env: Envelope xmlns:env="http://www.w3.org/2001/09/soap-envelope/" env:encodingStyle="http://www.w3.org/2001/09/soap-encoding/"> env:mustUnderstand="1" 5 DEF

23. Information Management NTU SOAP Request and Response Request (partial) DEF Response (partial) 22.50

24. Information Management NTU SOAP Message in an HTTP Request POST /StockQuote HTTP/1.1 Host: www.example.org Content-Type: text/xml; charset="utf-8" Content-Length: nnnn SOAPAction: "http://example.org/2001/06/quotes" <m:GetLastTradePrice env:encodingStyle="http://www.w3.org/2001/09/soap-encoding" xmlns:m="http://example.org/2001/06/quotes"> DIS

25. Information Management NTU SOAP Message in an HTTP Response POST /StockQuote HTTP/1.1 HTTP/1.1 200 OK Content-Type: text/xml; charset="utf-8" Content-Length: nnnn <m:GetLastTradePriceResponse env:encodingStyle="http://www.w3.org/2001/09/soap-encoding" xmlns:m="http://example.org/2001/06/quotes"> 34.5

26. Information Management NTU A SOAP Use Case Source: Sun Microsystems, Inc.