What Is a SOAP Node?
A Web service is a software system that allows machine-to-machine interactions within a network. The service typically uses XML language as a program source to develop protocols necessary for network interactions. The XML protocols are developed to write and format messages, and these protocols also are meant to locate and transport messages from one machine to another. One such light-weighted protocol is referred to as Simple Object Access Protocol.
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SOAP
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SOAP is a protocol that helps share information in a decentralized and distributed network environment. Th protocol is coded in XML documents. The XML messages in SOAP consist of three parts. First, "envelope" that defines what is in a message, who should deal with it and how to process it. Second, a set of XML "encoding" rules and syntax procedures derived from other programming languages, databases and semi-structured data types. Third are the "convention" XML rules for representing remote procedure that calls for client-server exchanges.
SOAP Message
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A SOAP message is an XML document, apart from coding and convention syntax, also abides to four basic structural elements: envelope, header, "body and fault. Envelope is the main and the mandatory element of the XML document representing the message. The header is an optional child element of the SOAP envelope and contains entries that further define the nature of the envelope. The body of the SOAP message is mandatory and contains information intended for the ultimate recipient of the message. Fault, the final element in the SOAP message, is optional and carries message error and status reports.
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SOAP Nodes
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A SOAP node is a virtual terminal in a programming flow chart that identifies the logical process within which a SOAP message operates. A node can be applied in the protocol to transmit, process, receive or relay a SOAP message. A node that transmits the message is called a SOAP sender, and the one that accepts it is called a SOAP receiver. Further, the sender note from which the protocol message originates is called the initial SOAP sender and the note that indicates the final destination of the message is noted as the ultimate SOAP receiver. An intermediary node is a SOAP receiver and a SOAP sender, and forwards a SOAP message from the initial SOAP sender to the ultimate SOAP receiver
SOAP Message Path
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The SOAP message path is the set of SOAP nodes that indicate the flow of a SOAP message. A message path typically include sender, receiver and intermediary nodes. A path also illustrates the origin and final destination nodes of a SOAP message. In the simpler case, a SOAP message is transmitted between two nodes, from a sender to a receiver. However, in more complex cases, one or more intermediary nodes process SOAP messages, and then send it to the next node and the next node until the message reaches its final destination.
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