The following section provides a short definition of the central Web Service technologies SOAP and WSDL. Using these technologies, the Application Server can:
Provide existing functions (BAPIs, RFMs, IDocs, EJBs) as Web services
· Process Web services from any Web service provider.
SOAP
SOAP (Simple Object Access Protocol) is an XML-based protocol for information exchange in a decentralized, distributed environment. The following elements are defined by a SOAP specification:
· A processing model for messages
· An envelope for the exchange of XML documents
· Error handling
· The use of a transport protocol (for example, HTTP)
· An encryption schema for data types
WSDL
WSDL (Web Services Description Language) is an XML format for the description of Web services. The following elements are defined by WSDL:
· The Web service interface (IDL)
· One or more transport protocols that are used as access to the Web service (for example, SOAP)
· The Service Endpoints (URL)
Web Service Processing in the Application Server
Explanatory note:
· UDDI (Universal Description, Discovery and Integration) is a protocol that simplifies the finding of particular services and the corresponding companies over the Internet.
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