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

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 ( r.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 ( 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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