web services• In this presentation…

– what is a web service?– web service benefits– web service standards– web service definitions– web service actions

web services• what is a web service?

– programmable logic accessed using standard web protocols

– platform independent remote program calls– builds on commonly used standards

web services• web service benefits

– vendor independent– platform independent– flexible transport– standards based

web services• web service standards

– UDDI – Universal Description, Discovery and Integration

– WSDL – Web Services Description Language– SOAP – Simple Object Access Protocol– XML – eXtensible Markup Language– HTTP – Hypertext Transfer Protocol

web services• UDDI

– standard for registering web services– public or private registries– service and WSDL definitions listed

web services• UDDI

– two major public registries• http://uddi.microsoft.com• http://www-3.ibm.com/services/uddi

web services• WSDL

– describes• service name• operations• arguments• return types• custom types• text description• encoding• transport

web services• SOAP

– XML structure for passing requests and replies– Messages for each operation

web services• XML

– meta-language (a language to define other languages)

– human readable (sometimes)– SOAP defines the way XML is used in web services

web services• HTTP

– ubiquitous– firewall friendly– simple– web services can use other transports

web services• centric web services prerequisites

– Microsoft SOAP Toolkit V3.0– Web access

web services• web services actions

– WebDeclare– WebDescription– WebCall

web services• Web Services Description tool

– simple view

web services• Web Services Description tool

– advanced view

web services• WebDescription

– uses WSDL to define a web service– high level and simpler– implementation details derived from WSDL

web services• WebDescription

– Arguments• WSDL• Procedure• Alias

web services• WebDescription

WebDescription(http://www.richsolutions.com/RichPayments/

RichCardValidator.asmx?WSDL, GetCardType, )

web services• WebDeclare

– Low level definition of web service– WSDL not available– Uses structures in arguments or return value

web services• WebDeclare

– Arguments• URL• SoapAction• Procedure• Namespace• Alias• Arguments• Returns

web services• WebDeclare

WebDeclare (http://www.ebob42.com/cgi- bin/Romulan.exe/soap/IRoman, 

             urn:Roman-IRoman#IntToRoman,               IntToRoman,

,               Int As Integer,              return As String)

web services• WebCall

– execute the web service– must be defined earlier with WebDeclare or

WebDescription– Handles encoding of arguments and response

web services• WebCall

– Arguments• Procedure• Arguments• Returns

– WebCall (GetCardType, fldCardNumber, strCardType)

centric 8 Training

Workshop 3

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