1. Lecture 6 & 7 SOAP WSDL UDDI

2. Chapter 22Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Highlights eXtensible Markup Language (XML) Simple Object Access Protocol (SOAP) Web Services Description Language (WSDL) Directory Services Universal Description, Discovery, and Integration (UDDI)

3. Chapter 23Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Standards for Web Services

4. Chapter 24Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Markup History None, e.g., CSV Ad hoc tags SGML (Standard Generalized Markup L): complex, few reliable tools HTML (HyperText ML): simple, unprincipled, mixes structure and display XML (eXtensible ML): simple, yet extensible subset of SGML to capture new vocabularies Machine processible Generall, comprehensible (easier debugging), though verbose and arcane

5. Chapter 25Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns XML Basics and Namespaces <arbitrary:toptag xmlns="http://one.default.namespace/if-needed" xmlns:arbitrary="http://wherever.it.might.be/arbit-ns" xmlns:random="http://another.one/random-ns"> Optional text also known as PCDATA

6. Chapter 26Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns XML Schema Grammar (data definition language) for specifying valid documents Uses same syntax as regular XML documents: verbose and difficult to read Provides local scoping of subelement names Incorporates namespaces Types Primitive (built-in): string, integer, float, date, … simpleType constructors: list, union Restrictions: intervals, lengths, enumerations, regex patterns, Flexible ordering of elements Key and referential integrity constraints

7. Chapter 27Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Web Services: Basic Architecture Service Broker Service Provider Service Requestor Bind or invoke (SOAP) Find or discover (UDDI) Publish or announce (WSDL) Registry; well-known Not well-known

8. Chapter 28Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Basic Profile (BP 1.0) The Web Services Interoperability Organization (WS-I) has specified the following Basic Profile version 1.0: SOAP 1.1 HTTP 1.1 XML 1.0 XML Schema Parts 1 and 2 UDDI Version 2 WSDL 1.1

9. Chapter 29Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Describing a Service Name e.g., GetTemperature Types of Input Parameters e.g., (String, String) Types of Output Parameters e.g., Integer

10. Chapter 210Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns SOAP (Simple Object Access Protocol) Used to exchange messages via HTTP, SMTP, and SIP (Session Initiation Protocol for Internet telephony) Originally designed for remote-procedure calls (RPC) Works through firewalls on port 80 Character-based, so easy to encrypt/decrypt and thus easy to secure Inefficient due to character, not binary, data and large headers Does not describe bidirectional or n-party interaction

11. SOAP architecture An Envelope element that identifies the XML document as a SOAP message A Header element that contains header information A Body element that contains call and response information A Fault element containing errors and status information Chapter 211Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

12. Chapter 212Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Ex. SOAP Request POST /temp HTTP/1.1 Host: www.socweather.com Content-Type: text/xml; charset="utf-8" Content-Length: xxx SOAPAction: "http://www.socweather.com/temp" <env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> Honolulu now

13. Chapter 213Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Ex. SOAP Response HTTP/1.1 200 OK Content-Type: text/xml; charset="utf-8" Content-Length: xxx SOAPAction: "http://www.socweather.com/temp" <env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> 30

14. Chapter 214Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns WSDL: Web Services Description Language Describes a programmatic interface to a Web service, including Definitions of data types Input and output message formats The operations provided by the service Network addresses Protocol bindings

15. <wsdl:definitions name="Temperature" targetNamespace="http://www.socweather.com/schema" xmlns:ts="http://www.socweather.com/TempSvc.wsdl" xmlns:tsxsd="http://schemas.socweather.com/TempSvc.xsd" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <xsd:schema targetNamespace="http://namespaces.socweather.com" xmlns:xsd="http://www.w3.org/1999/XMLSchema"> Chapter 215Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

16. Chapter 216Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

17. Chapter 217Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

18. <wsdl:binding name="TempSvcSoapBinding" type="ts:GetTempPortType"> Chapter 218Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

19. <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <soap:operation soapAction="http://www.socweather.com/TempSvc"/> <soap:body use="literal" namespace="http://schemas.socweather.com/TempSvc.xsd"/> Chapter 219Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

20. socweather.com temperature service Chapter 220Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

21. Chapter 221Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns WSDL Data Model

22. Chapter 222Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Directory Services Support discovery: enable applications, agents, Web service providers, Web service requestors, people, objects, and procedures to locate each other White pages – entries found by name Yellow pages – entries found by characteristics and capabilities A basic directory might be a simple database (passive) or a broker/facilitator (active, that provides alerts and recruits participants) UDDI – both white pages and yellow pages, but passive

23. Chapter 223Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns UDDI: Universal Description, Discovery, and Integration UDDI is a Web service that is based on SOAP and XML UDDI registers tModels: technical descriptions of a service’s behavior businessEntities: describes the specifications of multiple tModels

24. Chapter 224Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Yellow, Green, and White Pages in UDDI

25. Chapter 225Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Data Model for UDDI

26. Chapter 226Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns WSDL  UDDI

27. Chapter 227Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns Chapter 2 Summary The main triad of Web services standards Bring together well-known ideas SOAP: object access and messaging WSDL: based on CORBA IDL UDDI: based on directories Provide necessary functionality for interoperation Are complicated in their details Meant for tool vendors rather than programmers Increasingly hidden by tools