An overview of soap (simple object access protocol) and its role in electronic commerce. It discusses existing distribution architectures and technologies, such as corba, dcom, java rmi, and unix-rpc, and their limitations for dynamic and interorganizational service integration. The document also introduces soap message structure and its use in the universal description, discovery and integration (uddi) project, which aims to create a platform-independent, open framework for describing, discovering, and integrating business services using the internet. Wsdl (web services description language) is introduced as a standard for describing service operations and message formats for these operations.
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SOAP: Related, Existing Technologies
Existing distribution architectures and technologies include OMG CORBA, Microsoft DCOM, Java RMI, Unix-RPC, ...
But no single technology is used for dynamic and interorganizational service integration.
Some reasons: Unix-RPC: requires binary-compatible Unix systems on both sides
CORBA: not widely adoptedRMI: requires Java on both sides
DCOM: requires Windows systems on both sidesFirewall problems (packets are filtered by firewalls if using dynamic ports)
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SOAP Message Structure
SOAP extends HTTP request / responses with
SOAP-Header to identify that it’s a SOAP message
SOAP-Body containing an XML payload : the actual data to be transmitted
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Lookup Services: UDDI
The open framework for Universal Description, Discovery and Integration (UDDI) project aims at creating a platform-independent, describing servicesdiscovering businesses and as well as an^ ^ integrating business services using the Internet, UDDI uses SOAP as protocol.^ ^ operational registry (i.e., naming service) [UDDI02]. A Currently, there exist some public UDDI nodes at IBM and Microsoft, HP, etc. UDDI node is a global directory service for companies and web services that companies provide. See: http://www.uddi.org
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UDDI (2)
Content types of UDDI nodes: White Pages: General information about companies:
name, address, contact, etc. Yellow Pages: Classification of companies
Based on existing, non-electronic standards (example: North American Industry Classification System, NAICS)
Green Pages: WebServices will be explained in 6.3.4. Technical information about WebServices provided by a company.
types: used in the messages sent between the server and client. Specifies all the data types, either predefined or user-provided, that are
message: request message. Describes a one-way message, may it be a request or response to a
portType operation (for instance for a request/response scheme commonly used in SOAP : Combines multiple message elements to one one-way or round-trip
services). binding: Specifies how the service will be implemented ‘on the wire’, meaning it
gives details on how messages should be transported over the Internet. They can be sent via HTTP, using either the GET or POST method, or SOAP (which itself again can
be configured to work over HTTP, or e.g., SMTP). service: Defines the address for invoking the service, usually a URL where a
