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Web Services

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  1. Web Services A set of tools and protocols which enable software applications to communicate, pass data and issue commands to each other over the Internet or Intranet. Session 7

  2. Web Services – XML 1.2 Online Auto Dealership An interface that describes a collection of operations that are network accessible thru standardized XML messaging. Self-contained, modular apps that are over the internet --described--published--located--invoked Session 7

  3. Web Services • Applications • Talk to each other • Pass data to each other • Send commands back and forth • Can be inside / outside the firm • Standards: • Vendor specific with EAI or BPI • None with Java • Core set with XML • XML transfer over HTTP or SOAP Session 7

  4. Web Services • XML (Extensible Markup Language) customizable method for tag creation • SOAP (Simple Object Access Protocol) msg protocol to encode XML • UDDI (Universal Description, Discovery and Integration) distrib directory of web services available • WSDL (Web Services Description Language) XML formatted lang for web svc • ebXML (electronic business Extensible Markup Language) modular suite of specs for standardizing XML globally for facilitating trade Session 7

  5. Web Services -- Limitations • The HTTP reliance – “sessionless” or “eventless” – when one computer interacts with another across internet – no ongoing connection between the two – no memory of the transaction -- interaction done thru requests/responses but can not maintain info between requests • Not good for complex transactions – banking, • Use SOAP as a work around Session 7

  6. Web Services -- Limitations Security – authorization and encryption not basic -- non-repudiation messy (when company gets confirmation of PO – can not be undone Work Arounds -- customized systems interacting with untouched web services at other firms – messy -- no standard way to do interface Work Services Networks -- an integration hub available thru subscription Session 7

  7. Information Management Information Management faces 4 challenges • Information overload – help needed on filtering / selecting • Digital Rot – longevity of digital knowledge undermined by assumptions • Everything is kept / nothing crashes • Digital format captures everything • Library can sort it out later Session 7

  8. Information Management • Multiplicity of formats/media4 nodes = 12 connectors then add more !!!! Session 7

  9. Information Management • Transaction and Version Management Now want digital trace of content’s history • How has file evolved from draft to finished copy? • Who has been sent file, who has approved, who has seen? • Has file been received? How accepted? Session 7

  10. Information Management • Transaction and Version Management The KEY is in the CAPABILITIES to associate relevant control info with any text indicating • The WHAT (added, deleted, changed) • The WHO • The WHEN And maintaining that text within or linking to the text • XML content is self-describing • XML had no rigid distinctions between • Content • Control Session 7

  11. Response to Information Management • XML provides standardized means for capturing, storing, describing: • Information content and structure • Rules and information about how that control s/be understood, managed, stored, and referenced • How the content is transmitted, transformed and/or presented • How content is related to each other Session 7

  12. Web Services – Top Ten • Think plumbing between computer pgms to pass • Data/Content • Command • Web Services – next logical step in integrating the Internet into the Enterprise • Standards not really up to par yet – many things need agreement before it can take off • XML is the heart of web services • Probably org is already using web services but not aware • If implemented well, greatly decreases complexity of system integration for org • Web Services will be THE protocol for data exchange over the Internet • Sun Microsystem’s J2EE and MS’s .NET – 2 main platforms of choice for development • Most Web Services is intraorganizational today • Next growth phase – B2B communications -- Session 7

  13. Question: • EDI is electronic data interchange – • Uses traditional record format to record transactions between firms • Has standards the X.25 for example • Has been around since 1970’s • Used to transmit transactions between suppliers/customers • Expensive to implement and maintain • Will Web Services take over from EDI? Session 7